Faculty Profiles - YAMAGUCHI Tomiko

Papers - YAMAGUCHI Tomiko

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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

CiNii Article

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

Scopus

CiNii Article

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

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Papers - YAMAGUCHI Tomiko