Faculty Profiles - YAMAGUCHI Tomiko

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85149393855&origin=inward

Achieving the lightweight wear-resistant TiC reinforced AlFeCrCo medium-entropy alloy coating on Mg alloy via resistance seam processing Reviewed International journal

Zhao D., Kong D., Huang J., Wang M., Yamaguchi T., Wang H.

Scripta Materialia 210 2022.03

High-temperature oxidation performance of laser-cladded amorphous TiNiSiCrCoAl high-entropy alloy coating on Ti-6Al-4V surface Reviewed International journal

Li S., Yamaguchi T.

Surface and Coatings Technology 433 2022.03

High-temperature oxidation behavior of laser-cladded refractory NiSi<inf>0.5</inf>CrCoMoNb<inf>0.75</inf> high-entropy coating Reviewed International journal

Li S., Yamaguchi T.

Journal of Materials Research and Technology 17 1616 - 1627 2022.03

Microstructure characterization and wear performance of WC-10Co/Ti-6Al-4V coating fabricated via electron beam cladding Reviewed International journal

Chen Y., Wang D., Wang W., Liu Y., Sato Y.S., Yamaguchi T., Chen Y., Wang C.

Surface and Coatings Technology 422 2021.09

Microstructure and high-temperature properties of laser cladded AlCoCrFeNiTi<inf>0.5</inf> high-entropy coating on Ti 6Al-4V alloy Reviewed

Zeng X., Liu Z., Wu G., Tong X., Xiong Y., Cheng X., Wang X., Yamaguchi T.

Surface and Coatings Technology 418 2021.07

Preparation of high performance Fe-based amorphous coating by resistance seam welding Reviewed

Pan C., Zhang R., Wang D., Li Y., Yamaguchi T., Fan X., Zhao D., Wang W.

Surface and Coatings Technology 408 2021.02

Swirl-like Cu-Sn phase formation and the effects on the ultrasonic spot welded joint of Sn-coated Cu plates Reviewed

Li Y., Chu Z., Li X., Pan Y., Yamaguchi T., Wang W.

Journal of Materials Processing Technology 288 2021.02

Effect of flow of nitrogen side-feed on microstructure and crystal orientation in laser melting nitridation Reviewed International journal

Li S., Yamaguchi T., Danjo T., Hashimoto S.

Results in Optics 1 2020.11

レーザ照射による低炭素鋼および鋳物の部分硬化技術の開発 Invited Reviewed

山口富子,毛利陽一、北川善大

レーザ加工学会誌 ( レーザ加工学会 ) 27 ( 3 ) 44 - 45 2020.10

レーザによる表面改質 Invited Reviewed

山口富子

砥粒加工学会誌 ( 砥粒加工学会 ) 64 ( 8 ) 415 - 418 2020.08

Fabrication and friction properties of the AlFeCrCo medium-entropy alloy coatings on magnesium alloy Reviewed

Zhao D., Yamaguchi T., Tusbasa D., Wang W.

Materials and Design 193 2020.08

レーザ照射によるチタン合金表面への炭窒化及び硬化肉盛 Invited Reviewed

山口富子

チタン ( 一般社団法人　日本チタン協会 ) 68 ( 3 ) 42 - 45 2020.07

Formation and Friction Properties of Electron Beam Cladding (Ti, W)C<inf>1-x</inf> Composite Coatings on Ti-6Al-4V Reviewed International journal

Liu D., Chen Q., Wang D., Zhang R., Tomiko Y., Wang W.

Jinshu Xuebao/Acta Metallurgica Sinica 56 ( 7 ) 1025 - 1035 2020.07

Rapid fabrication of the continuous AlFeCrCoNi high entropy alloy coating on aluminum alloy by resistance seam welding Reviewed International journal

Zhao D., Yamaguchi T., Shu J., Tokunaga T., Danjo T.

Applied Surface Science 517 2020.07

Fabrication and wear performance of Al<inf>0.8</inf>FeCrCoNi high entropy alloy coating on magnesium alloy by resistance seam welding Reviewed

Zhao D., Yamaguchi T., Wang W.

Materials Letters 265 2020.04

Influence of a Ni Foil Interlayer on Interface Properties of Mg-Clad Al Materials by Vacuum Roll Bonding Reviewed International journal

Shu Jinfeng, Yamaguchi Tomiko, Hara Yuya

MATERIALS TRANSACTIONS ( The Japan Institute of Metals and Materials ) 61 ( 5 ) 1020 - 1025 2020.01

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

Mg-clad Al materials with a Ni foil interlayer were successfully prepared by vacuum roll bonding at a 450°C rolling temperature and 25% reduction, and the effects of the Ni foil interlayer on the interfacial properties were investigated. The clad materials with the Ni foil interlayer only formed the Mg2Ni intermetallic compound with a 0.9 µm thickness on the Mg–Ni interface, which was smaller than that of the intermetallic compounds (Al12Mg17 of 1.77 µm and Al3Mg2 of 7.76 µm) formed on the Al–Mg interface without the interlayer. The bonding strength of the interface increased from 0.79 MPa to 10.46 MPa. The growth characteristics of the Mg2Ni intermetallic compound on the Mg–Ni interface after heat treatment were investigated. The growth activation energy of Mg2Ni was 157.24 kJ/mol, which is higher than that of Al3Mg2 which mainly affects the Al–Mg interfacial bonding strength. Therefore, the thickness of the Mg2Ni was thinner and the interfacial bonding strength was greater after the vacuum roll bonding.

DOI： 10.2320/matertrans.MT-M2019277

Other Link： https://ci.nii.ac.jp/naid/130007806209

Growth Characteristics of Intermetallic Compounds on the Bond Interface of Magnesium-Clad Aluminum and Its Effect on Interface Properties Reviewed

Shu Jinfeng, Yamaguchi Tomiko

Journal of Light Metal Welding ( Japan Light Metal Welding Association ) 58 ( 0 ) 107s - 112s 2020.01

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

The Al/Mg clad materials were produced by vacuum roll bonding. After bonding, the clad materials were heat treated at different temperatures. The growth of intermetallic compounds on Al/Mg bond interface was investigated. The results show that the growth of intermetallic compounds was very slow at 200℃ and only Al3Mg2 layer with 2 μm thickness was observed after 3h. Al3Mg2 and Al12Mg17 intermetallic layers were formed at and above 300℃, and the growth activation energy of Al3Mg2 (86.18 kJ/mol) is smaller than that of Al12Mg17 (115.33 kJ/mol), so the growth of Al3Mg2 is faster and thicker. The thickness of intermetallic layer has a great influence on the tensile strength of Al/Mg interface. When the thickness of the intermetallic layer exceeded 20 μm, the tensile strength reduced to less than 6 Mpa. After 200℃ heat treatment, ductile fracture and brittle fracture occurred simultaneously at Al/Mg interface during tensile test. After heat treatment at and above 300℃, the fracture of Al/Mg interface occurred in the intermetallic layer and mainly in the Al3Mg2 layer, and the mode of fracture were cleavage fracture.

DOI： 10.11283/jlwa.58.107s

Other Link： https://ci.nii.ac.jp/naid/130007832378

Development of Partial Hardening Technology for Low Carbon Steel and Casting by Laser Irradiation Invited Reviewed

YAMAGUCHI Tomiko, MOURI Yoichi, KITAGAWA Yoshihiro

Journal of Jpan Laser Processing Society ( Japan Laser Processing Society ) 27 ( 3 ) 162 - 163 2020.01

Fabrication and characterization of Pr6O11-HfO2 ultra-high temperature infrared radiation coating Reviewed

39 ( 14 ) 4208 - 4215 2019.11

Fabrication and characterization of Pr<inf>6</inf>O<inf>11</inf>-HfO<inf>2</inf> ultra-high temperature infrared radiation coating Reviewed International journal

Liu F., Cheng X., Mao J., Li S., Shao H., Liu T., Yamaguchi T., Zeng X.

Journal of the European Ceramic Society 39 ( 14 ) 4208 - 4215 2019.11

Bond characteristics of Al/Mg clad materials produced by vacuum roll bonding Reviewed International journal

Shu J.F., Yamaguchi T.K.

IOP Conference Series: Materials Science and Engineering 576 ( 1 ) 2019.08

Hydrostatic pressure effects on superconducting transition of nanostructured niobium highly strained by high-pressure torsion Reviewed International journal

Mito M., Kitamura Y., Tajiri T., Nakamura K., Shiraishi R., Ogata K., Deguchi H., Yamaguchi T., Takeshita N., Nishizaki T., Edalati K., Horita Z.

Journal of Applied Physics 125 ( 12 ) 2019.03

Effect of creep degradation on hardness changes of Ni-based alloys for A-USC power boiler Reviewed International journal

Saito N., Ishiyama K., Yamaguchi T., Masuyama F.

ISIJ International ( The Iron and Steel Institute of Japan ) 59 ( 9 ) 1695 - 1704 2019.01

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

A project to develop Advanced Ultra-Supercritical (A-USC) power plant which operate at 700°C has been under way in Japan with the intension to reduce the CO2 emission and improve the power generation efficiency. Ni-based alloys, UNS N06674 (ASME Code Case 2826, 47Ni-23Cr-23Fe-7W, HR6W) and UNS N06617 (52Ni-22Cr-13Co-9Mo, Alloy 617) are candidate materials used in the high temperature regions of the A-USC power boilers. In this study, effect of creep degradation on the hardness change of both Ni-based alloys was investigated in order to evaluate the potential of the hardness method for creep life assessment. The investigation results showed that the scattering of hardness values in the latter stage of the creep life was increased as a result of hardening and softening of the material due to the increase of dislocation density with creep deformation and coarsening of precipitates followed by the formation of creep cavities, respectively. This tendency shows a good correlation with the creep life fraction. Therefore, it could be an useful tool for creep life evaluation. In addition, it was found that the hardness variation of the HR6W can be expressed as a function of temperature, stress and creep life fraction and thus leads to postulate a regression equation with hardness by a multivariate analysis. The creep life fraction can be calculated by substituting the values of service temperature and stress, and measured hardness into the multivariate regression equation. Those findings suggested that the hardness method was useful for the creep life assessment of Ni-based alloys.

DOI： 10.2355/isijinternational.ISIJINT-2018-878

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HIGH TEMPERATURE OXIDATION BEHAVIOR OF HIGH NITROGEN FERRITIC STEELS Reviewed

Masuyama F., Matsubara S., Tonoe Y., Yamaguchi T.

Joint EPRI-123HiMAT International Conference on Advances in High-Temperature Materials - Proceedings from EPRI's 9th International Conference on Advances in Materials Technology for Fossil Power Plants and the 2nd International 123HiMAT Conference on High-Temperature Materials 282 - 293 2019.01

High temperature oxidation behavior of high nitrogen 9%cr steels Reviewed International journal

Matsubara Shoichi, Yamaguchi Tomiko, Masuyama Fujimitsu

ISIJ International ( The Iron and Steel Institute of Japan ) 58 ( 11 ) 2095 - 2101 2018.11

Language：English Publishing type：Research paper (scientific journal)

High temperature oxidation behavior of high nitrogen steel with about 0.3 mass% of nitrogen has been investigated comparing with nitrogen-free steels and ASME grade 91. High temperature oxidation tests were carried out in air over the temperature range 750 to 850°C for 300 h at maximum. Weight gain was measured and oxide scales were observed using an optical microscope and analyzed with an electron probe X-ray microanalyzer. It was found that the oxidation resistance of the high nitrogen steel is superior to that of nitrogen-free steels and ASME grade 91. Furthermore, Cr concentration in the oxide scale of the high nitrogen steel was higher than that in other steels. These results indicate high nitrogen promotes the formation of the oxide scale with high concentration of Cr inhibiting oxidation from proceeding in the high nitrogen steel.

DOI： 10.2355/isijinternational.ISIJINT-2018-246

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Effect of Cr content and microstructure on high temperature oxidation behavior of high nitrogen heat-resistant ferritic steels Reviewed International journal

Matsubara Shoichi, Yamaguchi Tomiko, Masuyama Fujimitsu

ISIJ International ( The Iron and Steel Institute of Japan ) 58 ( 11 ) 2102 - 2109 2018.11

Language：English Publishing type：Research paper (scientific journal)

Effect of Cr content and microstructure on high temperature oxidation behavior of high nitrogen steels with 0.2–0.3 mass% of nitrogen has been investigated. For high temperature oxidation test 9–15%Cr high nitrogen steels are prepared. High temperature oxidation tests were carried out in air mainly at 800°C for 300 h at maximum. Weight gain was measured and oxide scales were observed using an optical microscope and analyzed with an electron probe X-ray microanalyzer. The addition of high nitrogen improved the oxidation resistance of 9–15%Cr high nitrogen steels. It was found that the oxidation resistance of the high nitrogen steels does not depend greatly on Cr content but on their microstructure. The oxidation resistance of high nitrogen ferritic heat-resistant steels increased as the fraction of martensite structure increased. These results indicate for high nitrogen steels Cr diffusion along grain boundaries is further promoted resulting in the formation of protective oxide scale having high Cr concentration.

DOI： 10.2355/isijinternational.ISIJINT-2018-247

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85056900942&origin=inward

Characteristics of surface modified Ti-6Al-4V alloy by a series of YAG laser irradiation Reviewed International journal

Zeng X., Wang W., Yamaguchi T., Nishio K.

Optics and Laser Technology 98 106 - 112 2018.01

Fabrication, microstructure, and wear performance of WC-Fe composite/metal coating fabricated by resistance seam welding Reviewed International journal

Wang W., Zeng X., Li Y., De Wang , Liu Y., Yamaguchi T., Nishio K., Cao J.

Materials Characterization 134 182 - 193 2017.12

抵抗クラッディング法によるアルミニウムクラッド材の開発

山口富子, 王文琴

フジコー技報　創る ( 株式会社　フジコー ) ( 25 ) 14 - 17 2017.12

New ferritic steel beyond grade 92 and its creep degradation assessment by hardness method for grade 91 Reviewed International journal

Masuyama F., Yamaguchi T.

ASME 2014 Symposium on Elevated Temperature Application of Materials for Fossil, Nuclear, and Petrochemical Industries, ETAM 2014 2017.01

Effect of Bonding Condition on Bond Strength of A1050/C1020 Clad Materials Using Vacuum Roll Bonding Reviewed

MATSUMOTO Satoru, Yamaguchi Tomiko, Nishio Kazumasa

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 2017 ( 0 ) 314 - 315 2017.01

YAGレーザ照射によるチタン上への硬質層の形成に関する研究 Reviewed

山口富子

天田財団助成研究成果報告書 ( 公益財団法人天田財団 ) 30 ( 0 ) 230 - 234 2017.01

Characteristics of Ti(C, N)/TiB composite layer on Ti-6Al-4V alloy produced by laser surface melting "jointly worked" Reviewed International journal

Xian Zeng,Tomiko Yamaguchi,Kazumasa Nishio

Optics & Laser Technology 80 84 - 91 2016.06

アルミニウム∕鋼のスポット溶接特性

山口富子

（一社）日本溶接協会誌　溶接技術 ( （一社）日本溶接協会 ) 64 ( 3 ) 53 - 56 2016.03

Creep degradation assessment of Ni-based alloys by hardness method Reviewed International journal

Masuyama F., Ishiyama K., Yamaguchi T.

Advances in Materials Technology for Fossil Power Plants - Proceedings from the 8th International Conference 137 - 148 2016.01

Chemical specification and design factor consideration for creep degradation in Grade 91 steel Reviewed International journal

Masuyama F., Yamaguchi T.

American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP 6B-2016 2016.01

FEM simulation of Welding Distortion in Laser-Arc Hybrid Welding Reviewed

Nakashima Tomoaki, Yamaguchi Tomiko, Nishio Kazumasa, Wada Yoji

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 2016 ( 0 ) 328 - 329 2016.01

TLP Diffusion Bonding of Pure Aluminum A1070 with Insert Metal Reviewed

GUO Haoming, Yamaguchi Tomiko, Nishio Kazumasa

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 2016 ( 0 ) 276 - 277 2016.01

Effects of Groove Shape on Welding Distortion in Laser-Arc Hybrid Welding Reviewed

Nakashima Tomoaki, Yamaguchi Tomiko, Nishio Kazumasa, Inoue Satohiro, Wada Yoji

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 2016 ( 0 ) 124 - 125 2016.01

Surface Modification of Carbon Steel for Machine Construction by Laser Irradiation

Tang Mingzhong, Yamaguchi Tomiko, Nishio Kazumasa

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 2016 ( 0 ) 74 - 75 2016.01

Laser surface melting of Ti6Al4V alloy with Ti-BN-C mixed powders Reviewed

Xian Zeng,Tomiko Yamaguchi,Kazumasa Nishio

Advanced Materials Research 1119 607 - 612 2015.07

Transformation process of weld heat-affected zone in solution-strengthened ferritic ductile cast iron Reviewed

Umetani, T., Takada, H., Ikeda, T., Yamaguchi, T., Era, H., Nishio, K.

Welding International 29 ( 5 ) 342 - 348 2015.05

Bond Strength and HR-TEM Observation of Clad Materials Produced Using a Vacuum Roll Bonding Method

Tomiko YAMAGUCHI

Journal of Smart Processing -for Materials, Environment & Energy - ( Smart Processing Society for Materials, Environment & Energy ) 4 ( 2 ) 79 - 82 2015.03

Microstructure and wear behavior of cermet/iron alloy cladding layers on A6061 alloy coated by resistance seam welding method Reviewed

Wenqin Wang, Tomiko Yamaguchia, Kazumasa Nishio

Acta Metallurgica Sinica 28 ( 1 ) 414 - 423 2015.02

Surface nitrocarburizing of Ti-6Al-4 V alloy by YAG laser irradiation Reviewed

Xian Zeng, Tomiko Yamaguchi, Kazumasa Nishio

Surface and Coatings Technology 262 1 - 8 2015.01

Computational fluid dynamics analysis of shielding gas behaviour in tungsten inert gas welding of titanium plate Reviewed

Yoji, W., Satohiro, I., Hiroshi, T., Tomiko, Y., Kazumasa, N.

Welding International 29 ( 1 ) 18 - 26 2015.01

Formation of Ti(C, N) film on Ti-6Al-4V alloy by YAG laser irradiation

Zeng Xian, Yamaguchi Tomiko, Nishio Kazumasa

Preprints of the National Meeting of JWS 2015 ( 0 ) 26 - 27 2015.01

Bond Strength and HR-TEM Observation of Clad Materials Produced Using a Vacuum Roll Bonding Method

YAMAGUCHI Tomiko

Journal of Smart Processing 4 ( 2 ) 79 - 82 2015.01

Structure of Iron-Based Cladding Layer on Al-Mg-Si Alloy Coated by a Resistance Seam Welding Method Reviewed

Wenqin Wang, Tomiko Yamaguchi, Kazumasa Nishio

Materials Transactions 55 ( 11 ) 1698 - 1706 2014.11

Advanced creep strength enhanced ferritic steel and its creep softening in comparison with grades 91 and 92 Reviewed

F. Masuyama and T. Yamaguchi

Proc. 40th MPA-Seminar 2014.10

Improvement of the Wear Resistance of A6061 Plate by Resistance Seam Welding with High Carbon Iron Alloy Powders Reviewed

Wenqin Wang, Tomiko Yamaguchi, Naoyuki Ohno, Kazumasa Nishio

Advanced Materials Research 941 ( 944 ) 2093 - 2097 2014.06

Formation of TiC0.3N0.7/TiN composite film on Ti-6Al-4V alloy by YAG laser irradiation Reviewed

Xian Zeng,Tomiko Yamaguchi,Yutaka Ida,Kazumasa Nishio

Advanced Materials Research 941 ( 944 ) 2202 - 2206 2014.06

Creep /creep dominant C-F failure initiation in martensitic steel welds Reviewed

F. Masuyama and T. Yamaguchi

ECCC2014 Creep & Fracture 2014-3rd International ECCC Conference 2014.05

Dismillar Meal Bond by Vacuum Roll Bonding

YAMAGUCHI Tomiko

JOURNAL OF THE JAPAN WELDING SOCIETY ( THE JAPAN WELDING SOCIETY ) 83 ( 3 ) 186 - 188 2014.04

New ferritic steel beyond grade 92 and its creep degradation assessment by hardness method for grade 91 Reviewed

F. Masuyama and T. Yamaguchi

ASME Symposium on Elevated Temperature Application of Materials for Fossil, Nuclear, and Petrochemical Industries 2014.03

Creep degradation and life assessment of high temperature welds Reviewed

960 - 972 2014.01

Dismillar metal bond by vacuum roll bonding Reviewed

83 ( 3 ) 186 - 188 2014.01

Developing large size hardmetal/steel wear resistant composite for hot-rolling mill descaling machine

HONDA TSUGUO, KUROKI HIRONORI, YAMAGUCHI TOMIKO, NISHIO KAZUMASA

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 2014 ( 0 ) 292 - 293 2014.01

鋳鉄/鋼肉盛クラッド圧延材の機械的性質と制振性能

本田嗣男, 黒木博憲, 山口富子, 西尾一政

鋳造工学全国講演大会講演概要集 ( 公益社団法人日本鋳造工学会 ) 164 ( 0 ) 98 - 98 2014.01

Production of magnesium alloy /aluminum / steel clad metals using vacuum roll bonding and influence of bonding condition on bondabilities of the clad metals

YOSHIDA HIROKI, YAMAGUCHI TOMIKO, NISHIO KAZUMASA, MATSUOKA YUTA

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 2014 ( 0 ) 144 - 145 2014.01

球状黒鉛鋳鉄の溶接熱影響部組織形成に及ぼす各種因子の影響

梅谷拓郎, 髙田洋吉, 池田朋広, 山口富子, 恵良秀則, 西尾一政

鋳造工学全国講演大会講演概要集 ( 公益社団法人日本鋳造工学会 ) 164 ( 0 ) 99 - 99 2014.01

Formation of wear resistance cladding layer on Al alloy plate by electric resistance welding

Wang Wenqin, Yamaguchi Tomiko, Nishio Kazumasa, Ohno Naoyuki

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 2014 ( 0 ) 152 - 153 2014.01

形鋼圧延用アダマイトロールの肉盛溶接

本田嗣男, 黒木博憲, 山口富子, 西尾一政

鋳造工学全国講演大会講演概要集 ( 公益社団法人日本鋳造工学会 ) 165 ( 0 ) 26 - 26 2014.01

Double-Side Welding of Steel by Laser-Arc Hybrid Welding

INOUE Satohiro, WADA Yoji, YAMAGUCHI Tomiko, NISHIO Kazumasa

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 2014 ( 0 ) 96 - 97 2014.01

Development of high chromium cast iron surfaced wear-resistant machine parts using abrasive water jet machining

HONDA TSUGUO, KUROKI HIRONORI, YAMAGUCHI TOMIKO, NISHIO KAZUMASA

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 2014 ( 0 ) 136 - 137 2014.01

Creep life assessment of grade 122 steel based on hardness methods Reviewed

F. Masuyama and T. Yamaguchi

Proc. 6th International Conference Life/Defect Assessment and Failures in High Temperature Plant 2013.12

レーザ照射によるチタンの表面改質に及ぼすシールドガスの影響

山口富子,西尾一政

先端エコフィッティング技術研究センター　紀要 ( 国立大学　九州工業大学　先端エコフィッティング技術研究センター ) ( 3 ) 56 - 60 2013.10

マルテンサイト組織におけるクリープ損傷発生機構と寿命

増山不二光, 山口富子

日本材料学会第51 回高温強度シンポジウム講演前刷集 110 - 114 2013.10

Creep degradation in welds of creep strength enhanced ferritic steels Reviewed

F. Masuyama and T. Yamaguchi

Proc. 38th MPA-Seminar 2013.10

Wear properties of HIP consolidated iron-base hard alloy powder

HONDA Tsuguo, KUROKI Hironori, YAMAGUCHI Tomiko, NISHIO Kazumasa

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 93 232 - 233 2013.08

Welding Metallurgy of Steels

HAYAKAWA Naoya, HIRATA Hiroyuki, KAYANO Rinzo, MIKAMI Yoshiki, YAMAGUCHI Tomiko, KOSEKI Toshihiko, SATO Yoshihiro

82 ( 5 ) 370 - 372 2013.07

Method to Calculate Ultrasonic Wave Velocity by Using Chemical Composition of Austenitic Stainless Steels Reviewed

Tatsuya YOSHIMOTO, Hideki HORIKAWA, Takumi SUGIOKA, Yoji WADA, Tomiko YAMAGUCHI and Kazumasa NISHIO

Welding in the World 57 ( 4 ) 457 - 465 2013.07

Interfacial Microstructure and Strength of Aluminum Alloys/Steel Spot Welded Joints Reviewed

Nan Wang,Yamaguchi Tomiko, Nishio Kazumasa

Journal of the Japan Institute of Metals 77 ( 7 ) 259 - 267 2013.07

Wear properties of hard phase dispersed metal matrix composites by HIP method

HONDA Tsuguo, KUROKI Hironori, YAMAGUCHI Tomiko, NISHIO Kazumasa

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 92 150 - 151 2013.03

Effects of welding time and alloy elements on mechanical properties of aluminum/SPCC joint using resistance spot welding Reviewed

PROGRESS IN MATERIALS AND PROCESSES, PTS 1-3 Advanced Materials Research 602 ( 604 ) 2123 - 2129 2013.02

Transformation process of weld heat affected zone in solution strengthened ferritic ductile cast iron Reviewed

Umetani, T., Takada, H., Ikeda, T., Yamaguchi, T., Era, H., Nishio, K.

Quarterly Journal of the Japan Welding Society 31 ( 2 ) 96 - 103 2013.02

Factors Influencing the transformation Process of Heat Affected Zone in Spheroidal graphite Cast Iron

UMETANI Takuo, TAKADA Hiroyoshi, IKEDA Tomohiro, YAMAGUCHI Tomiko, ERA Hidenori, NISHIO Kazumasa

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 2013 ( 0 ) 194 - 195 2013.01

高クロム鋳鉄溶着金属のアブレージョン抵抗に及ぼす溶接条件の影響

本田嗣男, 黒木博憲, 山口富子, 西尾一政

鋳造工学全国講演大会講演概要集 ( 公益社団法人日本鋳造工学会 ) 162 ( 0 ) 11 - 11 2013.01

肉盛溶接法による鋳鉄/鋼複合材料の熱処理性質

本田嗣男, 黒木博憲, 山口富子, 西尾一政

鋳造工学全国講演大会講演概要集 ( 公益社団法人日本鋳造工学会 ) 163 ( 0 ) 109 - 109 2013.01

Effects of welding conditions and alloy elements on weldability of aluminum/steel using resistance spot welding

WANG Nan, YAMAGUCHI Tomiko, NISHIO Kazumasa

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 91 320 - 321 2012.09

Effect of welding cracks on wear resistivity of high-chromium cast iron deposited metal

HONDA Tsuguo, KUROKI Hironori, YAMAGUCHI Tomiko, NISHIO Kazumasa

91 142 - 143 2012.09

高クロム鋼のクリープ損傷過程と硬さによる寿命評価

増山不二光, 山口富子

日本材料学会第50 回高温強度シンポジウム講演前刷集 109 - 113 2012.09

Creep softening and damage progress in creep strength enhancedferritic steels Reviewed

F. Masuyama and T. Yamaguchi

Proc. 4th Int. Conf. on the Integrity of High Temperature Welds and 9th Int. Conf. on Creep and Fatigue at Elevated Temperatures 2012.09

Formation of intermetallic phases on the bond interface of aluminum-clad copper Reviewed

50 ( 4 ) 15 - 19 2012.05

Formation of Intermetallic Phases on the Bond Interface of Aluminum-Clad Copper

YAMAGUCHI Tomiko, Xie Wei, NISHIO Kazumasa

JJournal of Light Metal Welding and Construction ( LIGHT METAL WELDING SOCIETY ) 50 ( 4 ) 15 - 19 2012.04

Microstructures at Heat Affected Zone of High Silicon Ductile Cast Iron

UMETANI Takuo, YAMAGUCHI Tomiko, ERA Hidenori, NISHIO Kazumasa, TAKADA Hiroyoshi, SHIIMOTO Keiichi, IKEDA Tomohiro

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 90 52 - 53 2012.03

Simulation of Grain Refinement using Monte Carlo Method

YAMAGUCHI Tomiko, IKEDA Hdeyuki,NISHIO Kazumasa

JOURNAL OF THE JAPAN WELDING SOCIETY ( JAPAN WELDING SOCIETY ) 81 ( 2 ) 26 - 31 2012.03

Numerical simulation of shielding gas behavior in tungsten inert gas welding of titanium plate Reviewed

Y. Wada,S. Inoue,H. Tsukamoto,T. Yamaguchi,K. Nishio

Sience and Technology of Welding and Joining 17 ( 2 ) 116 - 121 2012.02

Improvement of Wear Resistance of Surface Modificated Titanium using Laser Irradiation

YAMAGUCHI Tomiko, NISHIO Kazumasa

TITANIUM JAPAN ( The JAPAN TITANIUM SOCIETY ) 60 ( 1 ) 64 - 67 2012.01

Effect of welding crack on wear resistivity of high-chromium cast iron deposited metal

Honda Tsuguo, Kuroki Hironori, Yamaguchi Tomiko, Nishio Kazumasa

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 2012 ( 0 ) 142 - 143 2012.01

肉盛溶接法による鋳鉄/鋼複合材料の機械的性質

本田嗣男, 黒木博憲, 山口富子, 西尾一政

鋳造工学全国講演大会講演概要集 ( 公益社団法人日本鋳造工学会 ) 161 ( 0 ) 121 - 121 2012.01

高クロム鋳鉄のアブレージョン抵抗に及ぼす溶着金属組織の影響 Reviewed

本田嗣男,黒木博憲,山口富子,西尾一政

溶接学会論文集 29 ( 4 ) 312 - 318 2011.12

Development of Cast-iron/Steel Composite by Fusion Welding Reviewed

HONDA Tsuguo, KUROKI Hironori, YAMAGUCHI Tomiko, NISHIO Kazumasa

29 ( 1 ) 29 - 34 2011.12

Welding metallurgy of steels

80 ( 5 ) 54 - 57 2011.12

Surface nitriding and improvement of wear resistance of titanium using laser irradiation Reviewed

75 ( 12 ) 697 - 704 2011.12

Surface Nitriding and Improvement of Wear Resistance of Titanium Using Laser Irradiation Reviewed

YAMAGUCHI Tomiko, YONESHO Yutaka, NISHIO Kazumasa

Journal of the Japan Institute of Metals and Materials ( The Japan Institute of Metals and Materials ) 75 ( 12 ) 697 - 704 2011.12

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

Pure titanium is a biocompatible material that is also useful in high-temperature environments, however, wear resistance of the pure titanium is weak. To improve the wear resistance of pure titanium, surface modification is performed using laser beam heating under various laser conditions. The modified surface layer produced by laser melting consists of titanium nitride (TiN), which improves the hardness and the wear resistance. However, the surface of this modified layer is not flat.   In this study, the laser irradiation was performed in a controlled atmosphere and the effects of the atmosphere on the microstructure, hardness, and wear resistance of the irradiated region were investigated. As the pure titanium surface was heated by laser irradiation, a TiN film was formed on its surface without the introduction of cracks. A lamellar structure was also observed under the TiN film. The maximum TiN thickness obtained without cracking or peeling of the base metal was approximately 13 µm. In comparison with the base metal, the hardness and wear resistance of the TiN film were approximately 8 and 22 times higher, respectively.

DOI： 10.2320/jinstmet.75.697

Other Link： https://ci.nii.ac.jp/naid/10030260305

Surface Nitriding and Improvement of Wear Resistance of Titanium Using Laser Irradiation Reviewed

Tomiko Yamaguchi, Yutaka Yonesho, Kazumasa Nishio

Journal of the Japan Institute of Metals 75 ( 12 ) 697 - 704 2011.12

Interface Microstructure and Mechanical Properties of Aluminum/Copper Stud Welds Reviewed

Tomiko Yamaguchi, Sho Hiramoto, Kazumasa Nishio

49 ( 12 ) 474 - 478 2011.12

Formation of Intermetallic Compounds on the Bond Interface of Aluminum-Clad Copper and its Influence on Bond Tensile Strength Reviewed

117 ( 119 ) 984 - 989 2011.11

Interface Microstructure and Weld Strength of Steel/Aluminum Alloy Joints by Resistance Spot Welding Reviewed

117 ( 119 ) 1895 - 1899 2011.10

Development of Grizzly Plate by Surfacing of High Chromium Cast Iron and Abrasive Waterjet Machining Reviewed

HONDA Tsuguo, KUROKI Hironori, YAMAGUCHI Tomiko, NISHIO Kazumasa

Journal of Japan Foundry Engineering Society ( Japan Foundry Engineering Society ) 83 ( 9 ) 519 - 524 2011.09

Language：Japanese Publishing type：Research paper (scientific journal)

In order to develop wear resistant grizzly plates for sintered ore screening process, a commercial hypereutectic high chromium cast iron containing Nb and V carbides was surfaced by self-shielded tubular-cored arc welding to 32mm thick, 350mm wide and 1000mm long SS400 plates. First, Abrasive Waterjet (AWJ) machinability was investigated using the surfaced SS400 specimens of various thickness, then the abrasion resistance of the deposited metals and conventionally used material was reviewed.   The durability of the newly developed grizzly plates surfaced to 1000mm square SCW490 base metal and machined by AWJ was assessed under the impact and abrading of sintered ore, and compared with conventional cast plates. The main results obtained were as follows ;   (1) When surfacing was carried out with a single torch, transverse cracks generated considerably. On the other hand, the cracks reduced markedly with two-torch surfacing.   (2) The deposited metal showed good abrasion resistance. The AWJ maximum traverse rate however reduced to about half that of SS400 plate.   (3) AWJ machinability significantly reduced when the abrasive waterjets traversed across the cracks, forming uncut zones beneath the cracks by the deflection of the jets.   (4) The newly developed grizzly plates showed about four to six times more durability, while the conventional cast plates only last a couple of months.   (5) Presently, the newly developed grizzly plates are seen to be replacing conventional ones in the plant.

DOI： 10.11279/jfes.83.519

Other Link： https://ci.nii.ac.jp/naid/10029579889

Formation of Intermetallic compounds on the Bond Interface of Aluminum-Clad Copper and its influence on bond tensile strength

XIE Wei, YAMAGUCHI Tomiko, NISHIO Kazumasa

89 82 - 83 2011.08

レーザ照射によるチタンの表面改質について

西尾一政,山口富子

光技術コンタクト ( 日本オプトメカトロニクス協会 ) 49 ( 7 ) 16 - 21 2011.07

Welding Metallurgy of Steels

Hayakawa, N., Nakamura, S., Wang, K., Mikami, Y., Mochizuki, M., Yamaguchi, T., Koseki, T., Sato, Y.

JOURNAL OF THE JAPAN WELDING SOCIETY ( THE JAPAN WELDING SOCIETY ) 80 ( 5 ) 54 - 57 2011.07

Mechanical properties of aluminium alloy welds by laser beam Reviewed

Yamaguchi, T., Katoh, M., Nishio, K.

Welding International 25 ( 5 ) 360 - 368 2011.05

Observation of Molten Pool Behavior in TIG Welding of Titanium Plate

WADA Yoji, YOSHIMOTO Tatsuya, HORIKAWA Hideki, MIYAZAKI Koji, YAMAGUCHI Tomiko, NISHIO Kazumasa

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 88 114 - 115 2011.03

Formation of intermetallic phases on the bond interface of aluminum-clad copper Reviewed

Xie, W., Yamaguchi, T., Nishio, K.

Journal of the Japan Institute of Metals 75 ( 3 ) 166 - 172 2011.03

Development of cast-iron/steel composite by fusion welding Reviewed

Honda, T., Kuroki, H., Yamaguchi, T., Nishio, K.

Quarterly Journal of the Japan Welding Society 29 ( 1 ) 29 - 34 2011.02

レーザ表面改質法によるチタンの耐磨耗性改善

山口富子,西尾一政

溶射技術 ( 未設定 ) 30 ( 4 ) 72 - 76 2011.02

Evaluation of Carburized Depth of Cracking Tubes in Ethylene Plant by Means of Ultrasonic Technique Reviewed

Tatsuya YOSHIMOTO, Hideki HORIKAWA, Takumi SUGIOKA, Yoji WADA, Tomiko YAMAGUCHI and Kazumasa NISHIO

64th Annualy Assembly of International Institute of Welding (IIW),Commission V, IIW Doc. V-1504-11 2011.01

Formation of Intermetallic compounds and tensile strength on the Bond Interface of Aluminum-Clad Copper

xie wei, yamaguchi tomiko, nishio kazumasa

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 2011 ( 0 ) 38 - 38 2011.01

Computational Fluid Dynamics Analysis of Shielding Gas Behavior in Tungsten Inert Gas Welding of Titanium Plate Reviewed

WADA Yoji, INOUE Satohiro, TSUKAMOTO Hiroshi, YAMAGUCHI Tomiko, NISHIO Kazumasa

28 ( 4 ) 383 - 390 2010.12

Evaluation of physical properties on functionally graded piping joints made from copper and austenitic stainless steel powder by HIP Reviewed

165 - 170 2010.12

YAGレーザビーム照射による金属組織の微細化

西尾一政,山口富子

プラントエンジニア ( 未設定 ) 42 ( 12 ) 2 - 7 2010.12

Computational fluid dynamics analysis of shielding gas behavior in tungsten inert gas welding of titanium plate Reviewed

Wada, Y., Inoue, S., Tsukamoto, H., Yamaguchi, T., Nishio, K.

Quarterly Journal of the Japan Welding Society 28 ( 4 ) 383 - 390 2010.11

Stud Welding of Aluminium and Copper

ISHIMOTO Daichi, XIE Wei, YAMAGUCHI Tomiko, NISHIO Kazumasa, HIRAMOTO Syo

87 104 - 105 2010.08

YAGレーザ加熱による銅の結晶粒微細化に関する検討 Reviewed

山口富子,堀江慎一郎,西尾　一政

銅と銅合金 49 ( 1 ) 11 - 14 2010.08

Evaluation of physical properties on Functionally Graded Piping Joints made from Cu and austenitic stainless steel powder Reviewed

KOICHI Nakano,TOSHIO Anzai,YAMAGUCHI Tomiko,NISHIO Kazumasa

MULTISCALE, MULTIFUNCTIONAL AND FUNCTIONALLY GRADED MATERIALS 631 273 - 278 2010.07

History of railway

58 ( 5 ) 103 - 106 2010.05

Computational Fluid Dynamics Analysis of Shielding Gas Behavior in Tungsten Inert Gas Welding of Titanium Plate Reviewed

Yoji WADA,Satohiro INOUE,Hiroshi TSUKAMOTO,Tomiko YAMAGUCHI,Kazumasa NISHIO

IIW 2010.04

Simulation of Shielding Gas Behavior by CFD in TIG Welding of Titanium

WADA Yoji, INOUE Satohiro, TSUKAMOTO Hiroshi, MIYAZAKI Koji, YAMAGUCHI Tomiko, NISHIO Kazumasa

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 2010 ( 0 ) 192 - 192 2010.01

高クロム鋳鉄のアブレージョン抵抗に及ぼす溶着金属組織と後熱処理の影響

本田嗣男, 黒木博憲, 山口富子, 西尾一政

鋳造工学全国講演大会講演概要集 ( 公益社団法人日本鋳造工学会 ) 157 ( 0 ) 75 - 75 2010.01

Stud Welding of Aluminum and Copper

XIE Wei, HIRAMOTO Sho, YAMAGUCHI Tomiko, NISHIO Kazumasa, ISHIMOTO Daichi

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 2010 ( 0 ) 51 - 51 2010.01

アブレーシブウォータージェット切断を利用した過共晶高クロム鋳鉄溶接肉盛製篩分器の開発

本田嗣男, 黒木博憲, 山口富子, 西尾一政

鋳造工学全国講演大会講演概要集 ( 公益社団法人日本鋳造工学会 ) 156 ( 0 ) 109 - 109 2010.01

Grain Refinement of Austenitic Stainless Steel by Laser Irradiation Reviewed

YAMAGUCHI Tomiko, IMAMURA Naohide, KATOH Mitsuaki, NISHIO Kazumasa

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY ( JAPAN WELDING SOCIETY ) 27 ( 4 ) 270 - 277 2009.12

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

In structural materials, it is investigated to make crystal grain size less than 1μm in order to improve strength and toughness. Authors reported that fine ferrites were obtained by laser irradiation in steel. However, it is not made clear that an effect of laser irradiation on the materials which do not have a transformation. In this study, we performed laser irradiation for austenite stainless steel SUS304 as the materials which did not have a transformation and investigated an effect of laser irradiation on grain refinement. Solution treatments were performed for SUS304 and their initial grain size became 23 and 68μm. Then they were given four kinds of strain ε and irradiated laser under some laser traveling speeds ν and some defocus distances &fnof;d. As the result, they became recrystallization grain and their size were obtained about 10 and 15μm, for initial grain size respectively, under the best condition (laser power=1.5kW, fd=60mm, v=350 mm/min, ε= 40%). Then a recrystallization grain size was caused by each factor of laser traveling speed (heating temperature, heating time), strain and defocus distance. Furthermore, as an electro-gas arc weld of SUS304, the grain size was 40μm in heat affected zone, was irradiated after shot peening, it was clarified that fine grain was obtained from 10 to 15μm at the heat affected zone.

DOI： 10.2207/qjjws.27.270

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=75149143862&origin=inward

Monte Carlo simulation of grain refinement of ultra low carbon steel by cyclic laser irradiation Reviewed

ZHAO Fang, YAMAGUCHI Tomiko, IKEDA Hideyuki, KATOH Mitsuaki, NISHIO Kazumasa

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY ( JAPAN WELDING SOCIETY ) 27 ( 1 ) 89 - 95 2009.11

Language：English Publishing type：Research paper (scientific journal)

The refinement of ferrite grain of ultra low carbon steel was observed in cyclic laser irradiation. The high heating and cooling rates were considered to cause the promoted nucleation and the suppressed grain growth. The process of refinement of grain during the laser irradiation was investigated by Monte Carlo simulation. In order to obtain the accurate simulation, the apparent activation energy of austenite grain growth was measured by isothermal heating experiments and used in the simulation of austenite grain growth. The results of the austenite grain growth simulations had a good agreement with the experimental results. Consequently, α → ← γ phase transformations which involved temporal and spatial heterogeneous nucleation were modeled with Monte Carlo method in order to simulate the process of the cyclic laser irradiation. The phase transformed fraction of ferrite and austenite with high heating and cooling rates were also obtained by simulation, and the curves of transformed fraction of ferrite and austenite showed sigmoidal variations with temperature. The results of the simulations showed the decrease of ferrite and austenite grain size with increase of times of the cyclic laser irradiation, which could explain the refinement of ferrite grain by the cyclic laser irradiation.

DOI： 10.2207/qjjws.27.89

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=70449407192&origin=inward

純アルミニウム/銅クラッド材接合部の強度と高分解能TEM組織 Reviewed

山口富子,謝イ,恵良秀則,西尾一政

軽金属 59 ( 10 ) 542 - 547 2009.10

Grain refinement of austenitic stainless steel by laser irradiation Reviewed

Yamaguchi, T., Imamura, N., Katoh, M., Nishio, K.

Quarterly Journal of the Japan Welding Society 27 ( 4 ) 270 - 277 2009.10

急速加熱・急速冷却による金属組織の微細化

西尾一政,山口富子

ボイラ研究 ( 未設定 ) 357 ( 10 ) 20 - 24 2009.10

レーザ溶融によるチタンの耐摩耗性改善

山口富子, 恵良秀則, 西尾一政

チタン ( (社）日本チタン協会 ) 57 ( 4 ) 295 - 299 2009.10

Strength and HRTEM microstructure at bond interface of aluminum/copper clad materials Reviewed

YAMAGUCHI Tomiko, XIE Wei, ERA Hidenori, NISHIO Kazumasa

Journal of Japan Institute of Light Metals ( The Japan Institute of Light Metals ) 59 ( 10 ) 542 - 547 2009.10

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

It is known that it is difficult to bond dissimilar metals such as aluminum and copper or aluminum and iron using diffusion bonding, because an intermetallic compound is easily produced at the bond interface and bonding strength becomes low. However it is possible to bond the dissimilar metals using the vacuum roll bonding which performs hot rolling in a vacuum. In this study, we investigated the effect of bonding temperature and reduction of aluminum plate thickness on bonding strength of Al/Cu clad materials when aluminum-clad copper (Al/Cu clad) materials were produced at 3 Pa in vacuum degree by the vacuum roll bondings. Bond tensile strength of Al/Cu clad materials increased as the reduction was increased. Their fracture types were classified according to the fracture pass, that is, in the base metal of the aluminum, at the bond interface of Al/Cu clad material or in the base metal and/or at the bond interface. Furthermore, the bond interfaces of Al/Cu clad materials were observed using a transmission electron microscope and an electron dispersive spectroscopy. As a result, it was clarified that Al/Cu clad materials are soundly produced using the vacuum roll bonding when thickness of diffusion layer is less than 60 nm even if intermetallic compounds were developed.

DOI： 10.2464/jilm.59.542

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=73149120441&origin=inward

軽金属材料の表面改質と複合材料開発

西尾一政,山口富子

軽金属 ( 軽金属 ) 59 ( 7 ) 392 - 393 2009.07

連続冷却過程におけるγ→α相変態のモンテカルロ・シミュレーション Reviewed

趙放,山口富子,池田英幸,西尾一政

日本金属学会誌 73 ( 7 ) 495 - 501 2009.07

Crystallographic Observation for Au/Au Bond Interface by Ultrasonic Bonding Reviewed

SOGAWA Mitsuomi, OTSUBO Fumitaka, YAMAGUCHI Tomiko, NISHIO Kazumasa, ERA Hidenori

Journal of The Japan Institute of Electronics Packaging ( Japan Institute of Electronics Packaging ) 12 ( 4 ) 307 - 312 2009.07

Language：English Publishing type：Research paper (scientific journal)

A crystallography study and observation of microstructure were carried out on the joint of an Au ball and Au electrode formed using two modes of ultrasonic bonding which show differences under the life test. A non-bonded joint was seen on the samples using SEM observation. Also, it was found that the length of bonding of the LP sample, which was bonded using low ultrasonic output, was short compared with that of the HP sample, which was bonded using high ultrasonic output. From an analysis of the IPF image obtained using EBSD, the interface of the joint in the LP sample apparently retained the crystal orientation of the interface before bonding. However, {001} in the HP sample, the crystal grain formed parallel to the bonded plane in the newly formed large area without obvious interface from the joint. It was concluded from this that the crystal grain having the same axis as the Au ball formed in the Au electrode though the orientation was not obvious from SEM and TEM observation.

DOI： 10.5104/jiep.12.307

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84871181779&origin=inward

Research and education of light metals in Kyushu institute of technology Reviewed

Hasebe M., Ohtani H., Shinozaki N., Era H., Nishio K., Yamaguchi T.

Keikinzoku/Journal of Japan Institute of Light Metals 59 ( 7 ) 389 - 391 2009.07

Monte Carlo Simulation of .GAMMA..RAR..ALPHA. Transformation during Continuous Cooling Reviewed

Fang Zhao, Tomiko Yamaguchi, Hideyuki Ikeda, Kazumasa Nishio

Journal of the Japan Institute of Metals and Materials ( The Japan Institute of Metals and Materials ) 73 ( 7 ) 495 - 501 2009.07

Language：English Publishing type：Research paper (scientific journal)

The γ→α transformation during continuous cooling was simulated by Monte Carlo method on conditions of ten stages of cooling rate and nine stages of austenite grain sizes. The authors have investigated effects of cooling rate and initial austenite grain size on γ→α transformation and ferrite grain growth. Main results obtained are as follows. The relationship between ferrite grain sizes and cooling rate showed that the ferrite grain sizes hyperbolically decreased against the cooling rate until 500°C/s and then the ferrite grain refinement hardly occurred. The ferrite grain sizes were decreased with an decrease of the initial austenite grain sizes. γ→α transformation rate was increased with the refinement of initial austenite grain. A linear relationship between initial austenite grain sizes and final ferrite grain sizes was obtained by simulation of continuous cooling.

DOI： 10.2320/jinstmet.73.495

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=69749115986&origin=inward

極低炭素鋼に対する繰返しレーザ照射による結晶粒微細化のモンテカルロ・シミュレーション Reviewed

趙放,山口富子,池田英幸,加藤光昭,西尾一政

溶接学会論文集 27 ( 1 ) 89 - 95 2009.04

アルミニウム合金レーザ溶接部の機械的性質

山口富子 , 加藤光昭 , 西尾一政

軽金属溶接 ( 軽金属溶接構造協会 ) 47 ( 4 ) 151 - 160 2009.04

Mechanical properties of aluminum alloy welds by laser beam Reviewed

Yamaguchi T., Katoh M., Nishio K.

Keikinzoku Yosetsu/Journal of Light Metal Welding and Construction 47 ( 4 ) 13 - 22 2009.04

Au/Ag超音波接合部の結晶組織観察 Reviewed

十川三臣,山口富子,大坪文隆,西尾一政,恵良秀則

Mate 2009 361 - 366 2009.01

The development of composite consisting of cast iron / mild steel using fusion welding

HONDA TSUGUO, kuroki hironori, yamaguchi tomiko, nishio kazumasa

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 2009 ( 0 ) 95 - 95 2009.01

Investigation for Evaluating the Depth of a Carburized Layer by Means of Ultrasonic Technique

Yoshimoto Tatsuya, Horikawa Hideki, Yamaguchi Tomiko, Nishio Kazumasa, Sekine Kazuyoshi, Kasai Naoya

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 2009 ( 0 ) 56 - 56 2009.01

Wear characteristic of titanium using laser surface modification method Reviewed

Yamaguchi T., Nishio K., Era H., Katoh M.

Welding International 22 ( 9 ) 582 - 587 2008.10

アルミニウムと軟鋼とのスポット溶接について

西尾一政,山口富子,大槻みなみ

SVBL年報/九州工業大学 12 23 - 26 2008.09

Characteristics of stainless steel welding metal byAA-TIG Welding

GONDO Ryo, ANZAI Toshio, YAMAGUCHI Tomiko, NISHIO Kazumasa, SHINOHARA Makoto

Pre-Prints of the National Meeting of JWS ( Japan Welding Society ) 83 332 - 333 2008.08

アルミニウム青銅とステンレス鋼のスタッド溶接 Reviewed

芹野正幸,山口富子,永田修平,西尾一政

銅と銅合金 47 ( 1 ) 198 - 202 2008.08

Observation of Bonded Area of Au Bump and Cu Lead with Sn Plating by Thermo-Compression Bonding Reviewed

Mitsuomi Sogawa,Fumitaka Otsubo,Tomiko Yamaguchi,Hidenori Era,Kazumasa Nishio

International Conference on Electronics Packaging (ICEP2008) 291 - 296 2008.06

我が国の鉄道創成期に使用されたレールの変遷

西尾一政,山口富子,桝本弘毅,岡崎睦

金属 78 ( 3 ) 283 - 288 2008.03

超音波接合によるAu/Au界面の結晶組織観察

十川三臣,大坪文隆,山口富子,恵良秀則,西尾一政

第22回エレクトロニクス実装学会講演大会講演論文集 173 - 174 2008.03

官設鉄道創成から日本標準規格制定までのレール技術の変遷

西尾　一政,山口　富子,桝本　弘毅,岡崎　睦

日本の技術革新ー経験蓄積と知識基盤化ー研究成果集 51 - 54 2008.02

Flip Chip　実装による信頼性のあるAu/Al接合部の組織 Reviewed

十川三臣,大坪文隆,山口富子,西尾一政,恵良秀則

Mate 2008 195 - 200 2008.02

Observation of Crystallographic Microstructure of Au Ball/Au Electrode Joint by Ultrasonic Welding Reviewed

Sogawa Mitsuomi, Otsubo Fumitaka, Yamaguchi Tomiko, Nishio Kazumasa, Era Hidenori

Proceedings of JIEP Annual Meeting ( The Japan Institute of Electronics Packaging ) 22 ( 0 ) 173 - 175 2008.01

レーザ表面改質法によるチタンの耐摩耗性改善 Reviewed

山口富子,西尾一政,恵良秀則,加藤光昭

軽金属溶接 45 ( 12 ) 561 - 568 2007.12

Wear characteristic of titanium using laser surface modification method Reviewed

Yamaguchi T., Nishio K., Era H., Katoh M.

Keikinzoku Yosetsu/Journal of Light Metal Welding and Construction 45 ( 12 ) 9 - 16 2007.12

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

Laser surface modification method for pure titanium plate was performed using nitrogen gas as a shielding gas. The laser fusion layer obtained was investigated using the metallurgical analysis, a hardness test and an abrasion test. In the microstructure of the laser fusion layer, primary dendrite of TiN and eutectics composed of Ti and TiN were observed regardless of shielding gas flow rate. The Vickers hardness of the laser fusion layer increased with the increase in the shielding gas flow rate, and the laser fusion layer had the maximum Vickers hardness number of 1040 HV when a shielding gas flow rate was 40 L/min. As the abrasion property of the laser fusion layer in the shielding gas flow rate of 20 L/min was compared with that of the base metal TP270H, the wearing width of the laser fusion layer was decreased 50% below that of the base metal. In addition, the wear coefficient of the laser fusion layer became about 17% in comparison with that of the base metal.

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=38049177639&origin=inward

真空圧延接合法によるアルミニウム/銅クラッド材の作製とその特性

山口富子,惠良秀則,加藤光昭,西尾一政

第58回塑性加工連合講演会講演論文集 435 - 436 2007.10

レーザ照射によるステンレス鋼の結晶粒微細化

西尾一政,山口富子,今村直秀,堀江慎一郎

SVBL年報/九州工業大学 11 29 - 32 2007.09

レーザ照射による結晶粒の微細化

西尾一政, 加藤光昭, 山口富子

機能材料 ( シーエムシー出版 ) 27 ( 2 ) 56 - 60 2007.07

Evaluation of welds of aluminum alloy AA6022-T4 welded using an electrode force changeable resistance spot welding machine Reviewed

Furukawa K., Katoh M., Nishio K., Yamaguchi T., Nagata F.

Welding International 21 ( 7 ) 471 - 481 2007.07

Microstructure and Properties of Laser Fused Nickel Based Self Fluxing Alloy Coating Reviewed

Y.Li,K. Nishio,M. Katoh,T. Yamaguchi

Materials Science Research 15-17 135 - 140 2007.04

CMT溶接法を用いた亜鉛めっき鋼鈑とアルミニウム合金の溶接

加藤光昭,西尾一政,山口富子,古川一敏,谷垣尚

プレス技術 45 ( 1 ) 62 - 69 2007.01

Microstructure and properties of laser fused nickel based self fluxing alloy coating Reviewed

Li Y., Nishio K., Katoh M., Yamaguchi T.

Advanced Materials Research 15-17 135 - 140 2007.01

Influence of electrode pressure and welding conditions on the maximum tensile shear load Reviewed

Furukawa K., Katoh M., Nishio K., Yamaguchi T.

Welding Research Abroad 52 ( 8 ) 16 - 22 2006.12

CMT溶接法を用いた亜鉛めっき鋼鈑とアルミニウム合金の溶接部の特性 Reviewed

古川一敏,加藤光昭,西尾一政,山口富子,松本貴史,西本雄亮

軽金属溶接 44 ( 12 ) 547 - 555 2006.12

Effect of laser fusing on hot corrosion resistance of nickel based self fluxing alloy coating Reviewed

Li Y., Nishio K., Katoh M., Yamaguchi T., Okamine S.

Materials Science Forum 522-523 385 - 392 2006.12

Characteristics of welds between zinc plated steel sheet and aluminum alloy sheet using CMT process Reviewed

Furukawa K., Katoh M., Nishio K., Yamaguchi T., Matsumoto T., Nishimoto Y.

Keikinzoku Yosetsu/Journal of Light Metal Welding and Construction 44 ( 12 ) 547 - 555 2006.12

Language：English Publishing type：Research paper (scientific journal)

They developed CMT process in Fronius with which it is possible to perform fusion welding (they call as arc brazing) between zinc plated steel sheet and aluminum alloy sheet. We applied this process to perform welding between zinc plated SPCC (thickness of zinc: 7-22 μm) and A5052-O sheet (thickness: 0.8 mm) with a filler wire of A4043, and first examined the change in the thickness of zinc plated layer in HAZ. In the region from 400 to 800 μm from the toe into HAZ the thickness tended to decrease but recovered the original thickness after that. EPMA result shows that zinc distributed in the weld metal over the region about 30 μm near the weld interface and this should be dissolved in the weld metal. TEM result shows that the intermetallic compound layer of about 1 μm thickness was developed near the weld interface and made clear that these composed of Al13Fe4, Al3Fe2Si and Fe2Al3. Finally, the fracture occurred in the base metal of A5052 when we performed a tensile shear test on the welded joints and this showed that we could obtain good welded joints between zinc plated SPCC and A5052 through CMT process.

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加圧力可変抵抗スポット溶接機を用いたアルミニウム合金AA6022-T4の溶接部の評価 Reviewed

古川一敏,加藤光昭,西尾一政,山口富子,永田福太郎

軽金属溶接 44 ( 10 ) 17 - 30 2006.10

Evaluation of welds of aluminum alloy AA6022-T4 welded using electrode force changeable resistance spot welding machine Reviewed

Furukawa K., Katoh M., Nishio K., Yamaguchi T., Nagata F.

Keikinzoku Yosetsu/Journal of Light Metal Welding and Construction 44 ( 10 ) 449 - 462 2006.10

Language：English Publishing type：Research paper (scientific journal)

Resistance spot welding has been widely used in the field of automobile industry. The authors have developed a resistance spot welding machine by which electrode force can be easily changed during weld time. We studied the influence of electrode force (base electrode force P 0, primary electrode force P 1 and secondary electrode force P 2 and welding current I in spot welding on the properties of welds of aluminum alloy AA6022-T4 which is used in the automobile industry. We changed welding current and electrode force, and monitored temporal changes of electrode forces during the welding. Shapes of the temporal changes of electrode force monitored were classified in three kinds and these lead to the changes of the maximum tensile shear load F max of welds. Though some solidification cracks were observed in the thickness direction of specimens when welding currents and electrode forces were high, these did not affect the maximum tensile shear loads because sufficiently large nuggets were developed. Solidification cracks parallel to the specimen surface, however, lead to the decrease in F max. The results by regression analysis of the influence of P 0, P 1, P 2 and I on F max showed that F max increased with the increase in P 1 when P 0 = 2450 N but increased with the decrease in P 1 when P 0 = 3000 and 3430 N for the same welding current, and no influence of P 2.

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=33750719413&origin=inward

Modification of Sprayed Coating using YAG Laser

NOMURA Yukihiro, LI Yu, NISHIO Kazumasa, KATOH Mitsuaki, YAMAGUCHI Tomiko

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 79 330 - 331 2006.09

Development of cladding layer contained WC powder using electric resistance welding

KAMEOKA Syouhei, NISHIO Kazumasa, YAMAGUCHI Tomiko, KATO Mitsuaki, LIE Jinwoo, BIMASATO Shuichi, NAKAGAWA Takuhiro

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 79 336 - 337 2006.09

純Al/炭素鋼クラッド材の接合部特性と微細構造の観察―真空圧延接合法によるクラッド材の製造とその特性（第５報）― Reviewed

山口富子,西尾一政,加藤光昭,黒川哲平

溶接学会論文集 24 ( 3 ) 215 - 222 2006.08

Properties and HR-TEM observations of Al/Mild steel clad materials - Development of clad materials by vacuum roll bonding and its characteristics (part 5) Reviewed

Yamaguchi T., Nishio K., Katoh M., Kurokawa T.

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society 24 ( 3 ) 216 - 222 2006.08

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

We hold many expectations that aluminum-clad steel will be applied for functional material, structural transition joint for welding steel structure to aluminum structure and so on. In this study we investigated the effects of aluminum purity and/or bonding conditions, which were bonding temperature, reduction rate of aluminum plate thickness (R Al), vacuum degree, on bond tensile strength of aluminum-clad steels produced by the vacuum roll bonding. And also the bond interfaces were observed using a high-resolution transmission electron microscope (RE-TEM). When A1050/SS400 clad materials, which produced at more than 450°C in bonding temperature, more than 17% in R Al and less than 10 Pa in vacuum degree, were performed in tensile test, they fractured through base metal of the aluminum. The values of bond tensile strength were obtained over 100 MPa. The bond tensile strength of 4N-Al (99.99 mass%Al)/SS400 clad material, which produced at 500°C in bonding temperature, 20% in A Al and 3 Pa in vacuum degree, was obtained about 80 MPa and test piece fractured through base metal of the aluminum. In the analysis results for bond interface of A1050/SS400 clad materials (5001 in bonding temperature, 20% in R Al and 3 and 10 Pa in vacuum degree) using a HR-TEM and an electron dispersive spectroscopy (EDS), no intermetallic compound and continuously amorphous phase in thickness from 2 to 3 nm were observed. The composition of the amorphous phase consists of mostly Al, O, Fe and Si. For the bonding interface of 4N-Al/SS400 clad material (500°C in bonding temperature, 20% in R Al and 3 Pa in vacuum degree), amorphous phase and nano-crystal were observed using HR-TEM. Therefore, it was clarified A1050 and 4N-Al/SS400 clad materials obtained using a vacuum roll bonding were bonded through the amorphous phase.

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レーザ表面改質に関する研究

西尾一政,加藤光昭,山口富子,李　ユ

ＳＶＢＬ年報/九州工業大学 ( 10 ) 43 - 46 2006.06

Metallurgical properties of Ti alloy welded by laser

HIGAKI Shou, NISHIO Kazumasa, KATOH Mitsuaki, YAMAGUCHI Tomiko, YANAGA Hiroki

110 363 - 364 2006.04

Effect of Laser Fusing on Hot Corrosion Resistance of Nickel based SelfFluxing Alloy Coating Reviewed

Yu Li,Kazumasa Nishio,Mitsuaki Katoh,Tomiko Yamaguchi,Shinji Okamine

Materials Science Forum 522-523 385 - 392 2006.04

Welding of Al/SPCC by CMT Process and its Characteristics

FURUKAWA Kazutoshi, KATOH Mitsuaki, NISHIO Kazumasa, YAMAGUCHI Tomiko, MATSUMOTO Takafumi, NISHIMOTO Yusuke

Preprints of the National Meeting of JWS ( Japan Welding Society ) 78 134 - 135 2006.03

Wear performance of WC-6.5%Co and Super Hard Alloy Cladding Layer by Electric Resistance Welding

LEE Jinwoo, NISHIO Kazumasa, KATOH Mitsuaki, YAMAGUCHI Tomiko

Pre-Prints of the National Meeting of JWS ( Japan Welding Society ) 78 248 - 249 2006.03

Modification of Nickel Based Self Fluxing Sprayed coating using YAG Laser

LI Yu, NISHIO Kazumasa, KATOH Mitsuaki, YAMAGUCHI Tomiko

78 104 - 105 2006.03

レーザ照射を利用した結晶粒の微細化技術

西尾一政,加藤光昭,山口富子

溶接技術 54 ( 3 ) 75 - 79 2006.03

Relation between Welding Conditions and Temporal Change of Electrode Force -Study on the Development of Electrode Force Changeable Lap Resistance Spot Welding Machine and Characteristics of Welds (Report 1)- Reviewed

FURUKAWA Kazutoshi,KATOH Mitsuaki,NISHIO Kazumasa,YAMAGUCHI Tomiko

Quarterly Journal of the Japan Welding Society 24 ( 1 ) 3 - 9 2006.02

Influence of electrode pressure and welding conditions on the maximum tensile shear load-Study on the Development of Electrode Force Changeable Lap Resistance Spot Welding Machine and Characteristics of Welds (Report 2)- Reviewed

FURUKAWA Kazutoshi,KATOH Mitsuaki,NISHIO Kazumasa,YAMAGUCHI Tomiko

Quarterly Journal of the Japan Welding Society 24 ( 1 ) 10 - 16 2006.02

Influence of electrode pressure and welding conditions on the maximum tensile shear load - Study on the development of electrode force changeable lap resistance spot welding machine and characteristics of welds (report 2) Reviewed

Furukawa K., Katoh M., Nishio K., Yamaguchi T.

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society 24 ( 1 ) 10 - 16 2006.02

Relation between welding conditions and temporal change of electrode force - Study on the development of electrode force changeable lap resistance spot welding machine and characteristics of welds (report 1) Reviewed

Furukawa K., Katoh M., Nishio K., Yamaguchi T.

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society 24 ( 1 ) 3 - 9 2006.02

八幡製鉄所ベッセマー転炉鋼製レールの製造法と材質

西尾一政,山口富子,松永守央,桝本弘毅,岡崎睦

金属 76 ( 1 ) 75 - 79 2006.01

Modification of Nickel Based Self Fluxing Alloy Coating with YAG Laser

Li Yu, Nishio Kazumasa, Katoh Mitsuaki, Yamaguchi Tomiko

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 2006 ( 0 ) 49 - 49 2006.01

Properties and HR-TEM Observations of Al/ Mild Steel Clad Materials-Development of Clad Materials by Vacuum Roll Bonding and its Characteristics (part 5)-:—Development of Clad Materials by Vacuum Roll Bonding and its Characteristics (part 5)— Reviewed

YAMAGUCHI Tomiko, NISHIO Kazumasa, KATOH Mitsuaki, KUROKAWA Teppei

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY ( JAPAN WELDING SOCIETY ) 24 ( 3 ) 215 - 222 2006.01

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

We hold many expectations that aluminum-clad steel will be applied for functional material, structural transition joint for welding steel structure to aluminum structure and so on. In this study we investigated the effects of aluminum purity and/or bonding conditions, which were bonding temperature, reduction rate of aluminum plate thickness (RAl), vacuum degree, on bond tensile strength of aluminum-clad steels produced by the vacuum roll bonding. And also the bond interfaces were observed using a high-resolution transmission electron microscope (RE-TEM). When A1050/SS400 clad materials, which produced at more than 450°C in bonding temperature, more than 17% in RAl and less than 10 Pa in vacuum degree, were performed in tensile test, they fractured through base metal of the aluminum. The values of bond tensile strength were obtained over 100 MPa. The bond tensile strength of 4N-Al (99.99 mass%Al) /SS400 clad material, which produced at 500°C in bonding temperature, 20% in RAl and 3 Pa in vacuum degree, was obtained about 80 MPa and test piece fractured through base metal of the aluminum. In the analysis results for bond interface of A1050/SS400 clad materials (500°C in bonding temperature, 20% in RAl and 3 and 10 Pa in vacuum degree) using a HR-TEM and an electron dispersive spectroscopy (EDS), no intermetallic compound and continuously amorphous phase in thickness from 2 to 3 nm were observed. The composition of the amorphous phase consists of mostly Al, O, Fe and Si. For the bonding interface of 4N-Al/SS400 clad material (500°C in bonding temperature, 20% in RAl and 3 Pa in vacuum degree), amorphous phase and nano-crystal were observed using HR-TEM. Therefore, it was clarified A1050 and 4N-Al/SS400 clad materials obtained using a vacuum roll bonding were bonded through the amorphous phase.

DOI： 10.2207/qjjws.24.215

Other Link： https://ci.nii.ac.jp/naid/130004445482

Wear behavior of Wc-6.5%Co and super hardness Alloy(SHA) cladding layer by electric resistance welding

Lee Jinwoo, Nishio Kazumasa, Katoh Mitsuaki, Yamaguchi Tomiko

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 2006 ( 0 ) 117 - 117 2006.01

Effect of Laser Fusing on Hot Corrosion Resistance of Nickel based SelfFluxing Alloy Coating Reviewed

Yu Li,Kazumasa Nishio,Mitsuaki Katoh,Tomiko Yamaguchi,Shinji Okamine

Proceeding of the International Symposium on High-temperature Oxidation and Corrosion 2005 2005.12

The performance of wear resistance cladding layer on a mild steel plate by electric resistance welding Reviewed

Jin Woo Lee,K. Nishio,M. Katoh,T. Yamaguchi ,K. Mishima

Welding in the World 49 ( 9/10 ) 94 - 101 2005.10

The performance of a wear resistance cladding layer on a mild steel plate by electric resistance welding Reviewed

Lee J., Nishio K., Katoh M., Yamaguchi T., Mishima K.

Welding in the World 49 ( 9-10 ) 94 - 101 2005.09

Surface Modification of Titanium Using Laser Beam Reviewed

YAMAGUCHI Tomiko, NISHIO Kazumasa, ERA Hidenori, KATOH Mitsuaki

Journal of the Japan Institute of Metals and Materials ( The Japan Institute of Metals and Materials ) 69 ( 7 ) 509 - 516 2005.07

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

Pure titanium has an excellent biocompatibility in comparison with stainless steels and Ti-Al-V alloys. We would expect pure titanium to have application for artificial joints and artificial bones if the wear resistance of the pure titanium were to be improved. So the surface modification of the pure titanium was performed using YAG laser beam. The laser power was 1.5 kW and Ar was used as the shielding gas. The shielding gas flow rate was changed from 5 to 40 L/min with a constant laser torch traveling speed of 500 mm/min. First, we investigated effects of the shielding gas flow rate on the Vickers hardness of the laser melted zone. When the shielding gas flow rate decreases, the average hardness increases and the oxygen and nitrogen concentrations of the laser melted zone also increase. We made clear the relationship between the average hardness and the nitrogen equivalent in the laser melted zone as follows. When the square root of the nitrogen equivalent (Neq=N+O/2) was less than 0.1, a plot of the average hardness for the square root of the nitrogen equivalent reveals a linear relationship. However, the average hardness of the laser melted zone increased more than the value indicated by the linear relationship when the square root of the nitrogen equivalent was above 0.1. Next, metallurgical analyses of the laser melted zone were performed using an electron probe micro analyzer (EPMA), an X-ray diffraction method (XRD) and a transmission electron microscope (TEM), and effects of the behavior of oxygen and nitrogen on the hardness of the laser melted zone were studied. A uniform dislocation structures in the laser melted zone is observed over a wide area where there is the linear relationship between the hardness and the square root of the nitrogen equivalent. Lamellar structure, which alternated between two phases of αTi and TiN in the laser melted zone, was formed where the hardness is greater than those indicated by the linear relationship. One phase of TiN contained a large quantity of nitrogen, and the other phase of αTi contained little nitrogen. It is found that the lamellar structure composes of αTi and Ti-nitrides (TiN and TiN0.26). It is also observed that a wide area of αTi possesses a twin structure with a high dislocation density.

DOI： 10.2320/jinstmet.69.509

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=24944468665&origin=inward

Evaluation by Ultrasonic Testing and TEM Observation of Bond Interface for Ultrasonic Bonds of 5052/SUS304 and 5052/SPCC Reviewed

H.Abdel-Aleem,KATOH Mitsuaki,NISHIO Kazumasa,YAMAGUCHI Tomiko,TSUE Yusuke

23 ( 2 ) 194 - 202 2005.05

Evaluation by ultrasonic testing and TEM observation of bond interface for ultrasonic bonds of 5052/SUS304 and 5052/SPCC Reviewed

Abdel-Aleem H., Katoh M., Nishio K., Yamaguchi T., Tsue Y.

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society 23 ( 2 ) 194 - 202 2005.05

レーザによるチタンの表面改質 Reviewed

山口富子,西尾一政,惠良秀則,加藤光昭

日本金属学会誌 69 ( 7 ) 509 - 516 2005.04

Modification of Ni-based Sprayed Coatings using YAG Laser

OKAMINE Shinji, LI Yu, NISHIO Kazumasa, KATOH Mitsuaki, YAMAGUCHI Tomiko

Preprints of the National Meeting of JWS ( Japan Welding Society ) 76 70 - 71 2005.03

Joining of 1050/5052 by resistance seam welding and materials evaluation of joints Reviewed

Abdel-Aleem H., Kato M., Nishio K., Yamaguchi T., Furukawa K.

Welding International 19 ( 3 ) 199 - 204 2005.03

Microstructure characterization of WC-6.5%Co and Super Hardness Alloy (SHA) cladding layer by electric resistance welding

Lee Jinwoo, Nishio Kazumasa, Katoh Mitsuaki, Yamaguchi Tomiko

Preprints of the National Meeting of JWS ( JAPAN WELDING SOCIETY ) 2005 ( 0 ) 208 - 208 2005.01

The influence of modeled B-H curve on the density of the magnetic leakage flux due to a flaw using yoke-magnetization Reviewed

Katoh M., Nishio K., Yamaguchi T.

NDT and E International 37 ( 8 ) 603 - 609 2004.12

Modification of Sprayed Coating with YAG Laser Reviewed

Yu Li,Kazumasa Nishio,Mitsuaki Katoh,Tomiko Yamaguchi,Shinji Okamine

New Frontiers of Process Science and Engineering in Advanced Materials(PSEAU¨E´04) 619 - 624 2004.11

摩擦撹拌溶接による純アルミニウム／5083異材接合とその継手特性 Reviewed

加藤光昭,西尾一政,山口富子,上村昌弘,大原進

軽金属溶接 42 ( 11 ) 553 - 562 2004.11

Lap welding of titanium and mild steel sheets by seam welding Reviewed

Nishio K., Kato M., Yamaguchi T., Tokunaga T., Matsumoto A.

Welding International 18 ( 10 ) 771 - 776 2004.10

抵抗シーム溶接した1050/5052の継手の材料評価 Reviewed

ハメド　アブデル　アリーム,加藤光昭,西尾一政,山口富子,古川一敏

軽金属溶接 42 ( 8 ) 379 - 386 2004.08

Influence of Oxide Film on the Bondability of Aluminum in Ultrasonic Bonding and Materials Evaluation of Bonds Reviewed

H.Abdel-Aleem,M.Katoh,K.Nishio,T.Yamaguchi,Y.Yamazaki

22 ( 3 ) 355 - 363 2004.08

Influence of oxide film on the bondability of aluminum in ultrasonic bonding and materials evaluation of bonds Reviewed

Abdel-Aleem H., Katoh M., Nishio K., Yamaguchi T., Yamazaki Y.

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society 22 ( 3 ) 355 - 363 2004.08

Joining of A1050/A5052 and A1050/Cu by ultrasonic bonding and their materials evaluation Reviewed

Abdel-Aleem H., Yamagata T., Katoh M., Nishio K., Yamaguchi T.

Welding Research Abroad 50 ( 8-9 ) 17 - 24 2004.08

20世紀に八幡製鉄所で製造されたレールの製造方法と材質

松永守央,西尾一政,山口富子,桝本弘毅,柏原正,岡崎睦

「鉄の歴史-その技術と文化-」フォーラム、日本鉄鋼協会/第6回公開研究発表会講演論文集 76 - 83 2004.07

The performance of wear resistance cladding layer on a mild steel plate by electric resistance welding Reviewed

Jin Woo Lee,K. Nishio,M. Katoh,T. Yamaguchi,K. Mishima

IIW, IX-2100-04 2004.07

マグネシウムの表面改質

山口真史,西尾一政,加藤光昭,山口富子,内林哲夫

溶接学会九州支部講演論文集 ( 1 ) 46 - 51 2004.07

モンテカルロ法による結晶粒の粗大化シミュレーション

段本智則,池田英幸,西尾一政,加藤光昭,山口富子

溶接学会九州支部講演論文集 ( 1 ) 69 - 73 2004.07

The influence of modeled B-H curve on the density of the magnetic leakage flux due to a flaw using yoke-magnetization Reviewed

NDT&E International 37 ( 6 ) 603 - 609 2004.06

レーザ照射によるチタンの表面改質層の摩耗特性

西尾一政,加藤光昭,山口富子,緒方幸博

ＳＶＢＬ年報/九州工業大学 ( 8 ) 36 - 40 2004.06

高周波誘導加熱による組織の微細化

西尾一政,加藤光昭,山口富子,斉藤伸彦

ＳＶＢＬ年報/九州工業大学 ( 8 ) 32 - 35 2004.06

Surface Modification of Titanium using Laser Beam Reviewed

Materials Transactions 45 ( 5 ) 1613 - 1619 2004.05

Al/Tiクラッド材接合部の微細構造の観察-真空圧延接合法によるクラッド材の製造とその特性（第４報)- Reviewed

西尾一政,加藤光昭,山口富子,恵良秀則,坂本憲一

溶接学会論文集 22 ( 2 ) 254 - 260 2004.05

Observation of Bond Interface of Al/Ti Clad Material by Transmission Electron Microscopy : Development of Clad Materials by Vacuum Roll Bonding and its Characteristics (Report 4) Reviewed

NISHIO Kazumasa, KATOH Mitsuaki, YAMAGUCHI Tomiko, ERA Hidenori, SAKAMOTO Kenichi

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY ( Japan Welding Society ) 22 ( 2 ) 254 - 260 2004.05

Language：English Publishing type：Research paper (scientific journal)

Clad materials consisting of aluminum and titanium plates were produced using the vacuum roll bonding method. This method produces an excellent bond without the intermetallic phase formation observable with conventional optical microscope. Bond interfacial structures in the Al/Ti clad material were observed by TEM, and the bonding mechanism were discussed. Tensile fracture occurred in the aluminum base metal of the clad material on the tensile test and the maximum tensile strength was 95 MPa. In addition, no cracks near the bonded zone were observed in the tensile fractured specimen. Nano-crystals and ultra fine-crystals were observed within the bonded zone using TEM. Within the ultra fine-crystal zone, the compositions of Al and Ti were approximately 80 and 20 at%, respectively. Precipitates those identified as a super lattice structure of the L12 type and an intermetallic phase TiAl3 (D022 type), which are nano-meter size particles, were observed within the ultra fine-crystal zone having Al solid solution (FCC crystal) supersatulated with Ti. The bonding mechanism of aluminum to titanium on the vacuum roll bonding method can be considered that very small thin regions of aluminum surface to be bonded are melted by frictional heat due to the great relative sliding between aluminum and titanium plates during the roll bonding. After that the bonded zone is cooled rapidly due to the diffusion of the heat from the bonded zone toward each base metal and rolls, therefore, the nano-crystals and the ultra fine-crystals are formed in the bonded zone.

DOI： 10.2207/qjjws.22.254

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=5444256456&origin=inward

Modification of Spraying Coatings using YAG Laser

LI Yu, OKAMINE Shinji, NISHIO Kazumasa, KATOH Mitsuaki, YAMAGUCHI Tomiko

Preprints of the National Meeting of JWS ( Japan Welding Society ) 74 20 - 21 2004.03

Wear characteristics of Al-Ti intermetallic compound

NONO Kiyoshige

17 ( 3 ) 2004.03

シーム溶接法によるチタン板と軟鋼板との重ね溶接 Reviewed

西尾一政,加藤光昭,山口富子,徳永辰也,松本敦夫

溶接学会論文集 21 ( 4 ) 553 - 559 2003.11

Joining of A1050/A5052 and A1050/Cu by Ultrasonic Bonding and their Materials Evaluation Reviewed

Hamed ABDEL-ALEEM,YAMAGATA Toshio,KATOH Mitsuaki,NISHIO Kazumasa,YAMAGUCHI Tomiko

21 ( 4 ) 493 - 500 2003.11

Joining of A1050/A5052 and A1050/Cu by ultrasonic bonding and their materials evaluation Reviewed

Abdel-Aleem H., Yamagata T., Katoh M., Nishio K., Yamaguchi T.

Yosetsu Gakkai Ronbunshu/Quarterly Journal of the Japan Welding Society 21 ( 4 ) 493 - 500 2003.11

Modeling of the yoke-magnetization in MFL-testing by finite elements Reviewed

Katoh M., Masumoto N., Nishio K., Yamaguchi T.

NDT and E International 36 ( 7 ) 479 - 486 2003.10

20世紀前半に八幡製鉄所で製造されたレールの材質

松永守央,西尾一政,山口富子,桝本弘毅,柏原正

「鉄の歴史ムその技術と文化ム」フォーラム、日本鉄鋼協会/第５回公開研究発表会論文集 76 - 83 2003.07

X-ray Study on Plastic Strain Distribution in Soft Zone of A5052-H Weld Metal Reviewed

M.Katoh,K.Nishio,T.Yamaguchi

Nondestructive Characterizaition of Materials XI 223 - 231 2003.06

Modeling of the yoke-magnetization in MFL-testing by finite elements Reviewed

Mitsuaki Katoh,Noritaka Masumoto,Kazumasa Nishio,Tomiko Yamaguchi

NDT & E International 36 ( 6 ) 479 - 486 2003.06

チタンのレーザ溶接部の材料学的性質に及ぼすシールドガスの影響

西尾一政,加藤光昭,山口富子,田中孝彦,江頭隆一

ＳＶＢＬ年報/九州工業大学 ( 7 ) 64 - 69 2003.06

Surface modification of titanium by laser irradiation

YAMAGUCHI T., NISHIO K., KATOH M., ERA H., OGATA Y.

72 144 - 145 2003.03

Grain refinement using high frequency induction heating

SAITOH Nobuhiko, NISHIO Kazumasa, KATOH Mitsuaki, YAMAGUCHI Tomiko

72 106 - 107 2003.03

Surface modification of titanium by laser irradiation

YAMAGUCHI T., NISHIO K., KATOH M., ERA H.

71 332 - 333 2002.09

Effect of Traveling Speed of Laser Beam on Grain Refinement

ETO Ryuichi, NISHIO Kazumasa, KATOH Mitsuaki, YAMAGUCHI Tomiko

71 334 - 335 2002.09

Bonding of dissimilar metals using vacuum roll bonding method

NISHIO Kazumasa, KATOH Mitsuaki, YAMAGUCHI Tomiko, KAWANO Takayuki

71 F - 23-F-28 2002.09

結晶粒の微細化に及ぼすレーザビーム移動速度の影響

西尾一政,加藤光昭,山口富子,江頭隆一

ＳＶＢＬ年報/九州工業大学６ 56 - 57 2002.08

Materials evaluation of diffusion bonded steel bar and its impact characteristics Reviewed

Mitsuaki Katoh,Kazumasa Nishio,Tomiko Yamaguchi

NDT & E International 35 ( 6 ) 263 - 271 2002.06

STUDY ON FALSE INDICATION DUE TO DIFFERENCE OF PERMEABILITY IN MAGNETIC TESTING OF STEEL WELDS Reviewed

Mitsuaki Katoh,Kazumasa Nishio,Tomiko Yamaguchi,Akhmadi Eko Wardoyo

Proceedings of the 6th Far-East Conference on Nondestructive Testing 315 - 320 2002.04

X-ray Study on Plastic Strain Distribution in Soft Zone of A5052-H Weld Metal Reviewed

Mitsuaki Katoh,Kazumasa Nishio,Tomiko Yamaguchi

11th International Symposium on NDCM 2002.04

Influence of several factors on liquation cracking in 6082 aluminum alloy GTA spot welds Reviewed

KATOH Mitsuaki, NISHIO Kazumasa, YAMAGUCHI Tomiko, OKANO Hirofumi

52 ( 2 ) 76 - 81 2002.02

6082系アルミニウム合金のティグアークスポット溶接部の液化割れに及ぼす諸因子の影響 Reviewed

加藤光昭,西尾一政,山口富子,岡野洋文

軽金属学会 52 ( 2 ) 76 - 81 2002.02

Influence of several factors on liquation cracking in 6082 aluminum alloy GTA spot welds. Reviewed

KATOH Mitsuaki, NISHIO Kazumasa, YAMAGUCHI Tomiko, OKANO Hirofumi

Journal of Japan Institute of Light Metals ( The Japan Institute of Light Metals ) 52 ( 2 ) 76 - 81 2002.02

Language：English Publishing type：Research paper (scientific journal)

Influences of chemical compositions of base metal, temperature difference ΔT between liquidus and solidus, and arc time on the susceptibility of liquation cracking were studied using the Varestraint test on 6082 aluminum alloy which was GTA spot welded. A commercial 6082 alloy and seven kinds of experimental 6082 alloy whose magnesium, silicon and manganese contents were changed were used. The susceptibility of liquation cracking was evaluated from the maximum crack length observed in heat affected zone after the Varestraint test. Liquation cracking was observed along grain boudaries on which low melting point compounds (mainly Mg2Si) were melted. The maximum crack length increased with arc time and ΔT. The addition of Si and Mg which increased ΔT promoted the liquation cracking, whereas the Mn addition suppressed the cracking by grain refining.

DOI： 10.2464/jilm.52.76

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0036475703&origin=inward

Materials evalution of diffusion bonded steel bar and its compact characteristics Reviewed

Katoh M., Nishio K., Yamaguchi T.

Welding in the World 45 ( 7-8 ) 24 - 30 2001.12

Change of Dissolved Amount of Magnesium and its Influence on Impact Energy of A5083 Welded with High Energy Density Welding Reviewed

YAMAGUCHI Tomiko, KATOH Mitsuaki, NISHIO Kazumasa

Quarterly journal of the Japan Welding Society. ( Japan Welding Society ) 19 ( 4 ) 656 - 663 2001.11

Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

In the weld metal of A5083 welded with high energy density such as electron beam and laser beam, the amount of solute (mainly magnesium) of the primary crystals tends to increase with the increase in the welding speed. The solute concentration of solid phase tends to increase generally with the increase in the solid fraction and increases rapidly near the last stage of solidification, that is, the dendrite boundary. Though the dissolved amount of magnesium in the weld metal estimated with X-ray diffraction technique becomes lower than that of the base metal, this tends to approach to that of the base metal after the weld metal was homogenized. In this paper, we examined these phenomena more precisely. First, we calculated the distributions of magnesium by applying the rapid solidificatio theory when the dendrite arm spacings (DAS) were changed to several steps. Then, the dissolved amount of magnesium in the dendrite was calculated by considering the distributions of magnesium and we made clear the influence of DAS on the dissolved amount of magnesium. Next, we also calculated the distributions of magnesium when the weld metal was homogenized and made clear the influence of DAS on the dissolved amount of magnesium after the homogenization. Moreover, the actual weld metals, in which DAS were changed, were obtained by changing the welding conditions with electron beam and we could experimentally confirm the same tendency as mentioned above which were simulated by the calculation. It was made clear that the Charpy impact energy of the weld metals linearly increased with the increase in the dissolved amount of magnesium.

Other Link： https://ci.nii.ac.jp/naid/110003422131

高エネルギー密度溶接をしたA5083における固溶Mg量の変化と衝撃値に及ぼす影響 Reviewed

山口富子,加藤光昭,西尾一政

溶接学会論文集 19 ( 4 ) 656 - 663 2001.11

Change of Dissolved Amount of Magnesium and its Influence on Impact Energy of A5083 Welded with High Energy Density Welding. Reviewed

YAMAGUCHI Tomiko, KATOH Mitsuaki, NISHIO Kazumasa

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY ( JAPAN WELDING SOCIETY ) 19 ( 4 ) 656 - 663 2001.11

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

In the weld metal of A5083 welded with high energy density such as electron beam and laser beam, the amount of solute (mainly magnesium) of the primary crystals tends to increase with the increase in the welding speed. The solute concentration of solid phase tends to increase generally with the increase in the solid fraction and increases rapidly near the last stage of solidification, that is, the dendrite boundary. Though the dissolved amount of magnesium in the weld metal estimated with Xray diffraction technique becomes lower than that of the base metal, this tends to approach to that of the base metal after the weld metal was homogenized. In this paper, we examined these phenomena more precisely. First, we calculated the distributions of magnesium by applying the rapid solidification theory when the dendrite arm spacings (DAS) were changed to several steps. Then, the dissolved amount of magnesium in the dendrite was calculated by considering the distributions of magnesium and we made clear the influence of DAS on the dissolved amount of magnesium. Next, we also calculated the distributions of magnesium when the weld metal was homogenized and made clear the influence of DAS on the dissolved amount of magnesium after the homogenization. Moreover, the actual weld metals, in which DAS were changed, were obtained by changing the welding conditions with electron beam and we could experimentally confirm the same tendency as mentioned above which were simulated by the calculation. It was made clear that the Charpy impact energy of the weld metals linearly increased with the increase in the dissolved amount of magnesium.

DOI： 10.2207/qjjws.19.656