Education Experience

March 1968 Graduated from Department of Mechanical Engineering, Faculty of Science and Engineering, Saitama University

May 1968 Research Student of Saitama University (～September 1968）

Working Experience

October 1968 Assistant at Science and Engineering of Saitama University

April 1969 National Research Institute for Metals, Science and Technology Agency

January 1980 Visiting researcher at Materials Testing Laboratory, University of Stuttgart (～January 1981)

July 1982 Specialist, Comprehensive Research Division, Research Coordination Bureau, Science and Technology Agency (～July 1983)

April 1993 General Manager of Environmental Performance Research Department, National Research Institute for metals

April 1996 Manager of Planning Office, National Research Institute for Metals (～March 1998)

October 2001 Director of Materials Information Technology Station, National Institute for Materials Science (～retired in March 2006)

April 2006 Consultant（～present）

April 2006 Leader of Standardization Team, Collaboration Promotion Office, national Institute for Materials Science (～March 2009）

April 2006 Special Researcher, The Society of Non-Traditional Technology (～March 2019)

November 2006 Idemitsu Engineering Co., Ltd, (～October 2018)

April 2009 Senior Advisor, National Center for Materials Service Safety, University of Science & Technology Beijing（～present）

April 2016 Director of Science and Society Research Center, Comprehensive Research Organization for Science and Society （～March 2019, and April 2022～present）

Doctor Degree

1986 Doctor of Engineering (University of Tokyo), Metallurgical study on creep-fatigue interaction of heat-resistant steels

Achievements

・ Creep behavior of heat-resistant steels under intermittent loading

・ Research on creep-fatigue interaction for heat-resistant steels

・ Development of fuel cladding tube for FBR－creep test

・ Study on creep life evaluation for boiler tubes

・ Study on creep crack growth behavior of heat-resistant steels

・ Development of NIMS creep data sheets

・ Development of NIMS materials database

・ Development of materials risk information platform

Awards and Social Activities

Awards

September 2005 Carl von Bach medal from University of Stuttgart

April 2007 Society Award (Technical Achievement) from The Japan Society of Mechanical Engineers

March 2008 Association Achievement Award (Noro Award) from The Iron and Steel Institute of Japan

April 2016 Small Ribbon of the Sacred Treasure fron Japanes Government

Social Activities

・Member of Nuclear Reactor Safety Examination Committee, Nuclear Safety Committee

・Chairman of High temperature section committee, The Society of Materials Science, Japan

・Director of The Iron and Steel Institute of Japan

・Chairman of Japan Pressure Vessel Research Committee (JPVRC)

・Japan representative of JPVRC-EPERC（Europe）-PVRC（USA）committee

・Chairman of Japan Committee of VAMAS (Versailes Project on Advanced Materials and Standards)

・Japan representative of VAMAS committee

・Chairman of Committee on allowable stresses for high Cr steels, Japan Power Engineering and  Inspection Corporation (JAPEIC）

and so on

Accident Investigation

December 1985～March 1986; Chairman of Sodium leakage accident investigation committee of Farst Breeder Reactir, Monju (FBR)

and so on

Publication List

(1) C.G. Shang, M.L. Wang, Z.C. Zhou, K. Yagi and Y.H. Lu: The microstructure evolution and its effect on creep behaviors in P92 steel under different stresses, Materials Characterization, 198 (20239, 112744

(2) Chao Fu, Yadong Chen, Xiaofei Yuan, Summy Tim, Stoichko Antronov, Koichi Yagi and Qiang Charles Feng: A modified θ projection method for constant load creep curve-1, Introduction of the model, Journal of Materials Science and Technology, 33 (2018), 223-230

(4) K. Kimura, M. Tabuchi, Y. Takahashi, K. Yoshida and K. Yagi: Long-term creep strength and strength reduction factor for welded joints of ASME Grades 91, 92 and 122 type steels, Int. J. Microstructure and Materials Properties, 6(2011), 72-90

(5) K. Yagi: Acquisition of long-term creep data and knowledge for new applications, International Journal pf Pressure Vessels and Piping, 85(2008), 22-29

(6) K. Yagi: Materials solution for safe society, Journal of Advanced Science, 13 (2001), 191-194

(7) K. Yagi, M. Tabuchi and K. Kubo: The influence of fracture mechanisms on the creep crack growth behavior of 316 stainless steel, Engineering Fracture Mechanics, 57 (1997), 463-473

(8) M. Tabuchi, K. Kubo and K. Yagi: Effect of specimen size on creep crack growth rate using ultra-large CT specimens for 1Cr-Mo-V steel, Engineering Fracture Mechanics, 40 (1991), 311-321

(9) K. Yagi, O. Kanemaru, K. Kubo and C. Tanaka: Life prediction of 316 stainless steel under creep-fatigue loading, Fatigue & Fracture of Engineering Materials & Structures, 9 (1987), 395-408

公開された論文数；185以上

Recent Presentations at International Conferences

(1) K. Yagi, M.L. Wang and Y.H. Lu: Life evaluation and research subjects for safe service of 9Cr steels used in USC power plant, MIMS-2 (Materials, Inspection, Monitoring & Assessment), (Online), October, 2022

(2) K. Yagi, M.L. Wang and Y.H. Lu: Research subjects for safe service of P92 steel used on USC power plants, International Workshop in 10th National Conference on Pressure Vessels Technology, (on-line), Hangzhou, China, September 2021

(3) K. Yagi, M.L. Wang and Y.H. Lu: Life evaluation of 9Cr steels used for a long time in USC power plant, ISSI 2020, (on-line), October, 2020

その他、多数

Cover of Books

Selection and application of suitable materials, Uchidaroukakuho, (2006), (in Japanese)

Creep Properties of Heat Resistant Steels and Superalloys, Representative editor, Springer, (2004)

Co-authored Books

Learning of Ecomaterials, Nikkagiren. (2002), involved as a secretary-general, (in Japanese)

Basis of risk-based engineering, Uchidaroukakuho, (2011), involved as a secretary-general, (in Japanese)

Many others