Faculty Profiles - YAMAGUCHI Tomiko

Papers - YAMAGUCHI Tomiko

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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.

Scopus

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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.

Scopus

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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.

Scopus

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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.

Scopus

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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

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Papers - YAMAGUCHI Tomiko