Faculty Profiles - YAMAGUCHI Tomiko

Papers - YAMAGUCHI Tomiko

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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

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

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

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

Scopus

CiNii Article

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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

Scopus

CiNii Article

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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

Scopus

CiNii Article

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

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Papers - YAMAGUCHI Tomiko