Introduction

Hiroyuki Kokawa was a full professor of Tohoku University in Japan from 1996 to 2017, and now is a professor emeritus, Tohoku University, Japan and a chair professor, Shanghai Jiao Tong University, from 2017.

Biographical Information

Hiroyuki Kokawa was a full professor of Tohoku University in Japan from 1996 to 2017, and now is a professor emeritus, Tohoku University, Japan and a chair professor, Shanghai Jiao Tong University, P. R. China. He graduated and received his PhD. degree in materials science from Tohoku University in 1979. Then he joined Welding Engineering and Technology Laboratory in Department of Materials Processing at Tohoku University, where he was the director of the laboratory for 21 years till his retirement in March 2017. He has performed considerable research regarding welding metallurgy, especially on grain boundary engineering and friction stir welding. He has authored or co-authored over 200 publications, and received many awards and prizes from academic societies, such as Japan Welding Society (JWS), American Welding Society (AWS), Japan Institute of Metals (JIM), Iron and Steel Institute of Japan (ISIJ). He was President of JWS (2014-2016), Executive Board Member of Japan Welding Engineering Society (JWES), Supervisor of Japan Institute of Metals (JIM), and now Executive Board Member of Japan Light Metal Welding & Construction Association (JLWA).

Research Interests

Grain boundary engineering, Friction stir welding and processing

Selected Publications

[1]   S. Mironov, Y.S. Sato, S. Yoneyama, H. Kokawa*, H.T. Fujii, S. Hirano, Microstructure and tensile behavior of friction-stir welded TRIP steel, Materials Science and Engineering A, 2018, 717: 26-33.

[2]   S. Tokita, H. Kokawa*, Y.S. Sato, H.T. Fujii, In situ EBSD observation of grain boundary character distribution evolution during thermomechanical process used for grain boundary engineering of 304 austenitic stainless steel, Materials Characterization, 2017, 131: 31-38.

[3]   S. Mironov, T. Onuma, Y.S. Sato, H. Kokawa*, Microstructure evolution during friction-stir welding of AZ31 magnesium alloy, Acta Materialia, 2015, 100: 301-312.

[4]   S. Shimizu, H.T. Fujii, Y.S. Sato, H. Kokawa*, M.R. Sriraman, S.S. Babu, Mechanism of weld formation during very-high-power ultrasonic additive manufacturing of Al alloy 6061, Acta Materialia, 2014, 74: 234-243.

[5]   H. Kokawa*, Potential of grain boundary engineering to suppress welding degradations of austenitic stainless steels, Science and Technology of Welding and Joining, 2011, 16: 357-362.

[6]   H. Kokawa*, M. Shimada, M. Michiuchi, Z.J. Wang, Y.S. Sato, Arrest of weld-decay in 304 austenitic stainless steel by twin-induced grain boundary engineering, Acta Materialia, 2007, 55: 5401-5407.

[7]   M. Michiuchi, H. Kokawa*, Z.J. Wang, Y.S. Sato, K. Sakai, Twin-induced grain boundary engineering for 316 austenitic stainless steel, Acta Materialia, 2006, 54: 5179-5184.

[8]   M. Shimada, H. Kokawa*, Z.J. Wang, Y.S. Sato, I. Karibe, Optimization of grain boundary character distribution for intergranular corrosion resistant 304 stainless steel by twin-induced grain boundary engineering, Acta Materialia, 2002, 50: 2331-2341.

[9]   Y. S. Sato, H. Kokawa*, M. Enomoto, S. Jogan, Microstructural Evolution of 6063 Aluminum during Friction-Stir Welding, Metallurgical and Materials Transactions A, 1999, 30: 2429-2437.

[10] H. Kokawa*, T. Watanabe, S. Karashima, Sliding Behaviour and Dislocation Structures in Aluminium Grain Boundaries, Philosophical Magazine A, 1981, 44: 1239-1254.

Research Projects

Honors & Awards

2018 West Lake Friendship Award, Zhejiang Province, China

2018 Scientific Achievement Award, Japan Welding Engineering Society

2018 Member of Honor, Japan Welding Society

2017 Japan Welding Society Award, Japan Welding Society

2017 Scripta Materialia 2016 Best Reviewer Award (Acta Materialia, Inc., Elsevier)

2014 Distinguished Achievement Award, Japan Institute of Metals

2014 Education Award, Japan Institute of Metals

2010 District Contribution Award, Japan Welding Society

2010 Fellow, Japan Welding Society

2006 Scientific Achievement Award, Japan Welding Society

2005 Honorary Professor, Northeast University, China

2004 Special Lecture, Korean Welding Society

2004 Best Author of the Year Award, Japan Welding Society

1998 Nishiyama Commemorative Prize, Iron and Steel Institute of Japan

1995 Meritorious Award, Japan Institute of Metals

1992 Professor Koichi Masubuchi Award, American Welding Society

1991 Best Paper of the Year Award, Japan Welding Society