Impact of friction stir welding on recrystallization of oxide dispersion strengthened ferritic steel

作     者：Wentuo Han Pingping Liu Xiaoou Yi Qian Zhan Farong Wan Kiyohiro Yabuuchi Hisashi Serizawa Akihiko Kimura 

作者机构：School of Materials Science and Engineering University of Science and Technology Beijing. Beijing 100083. China Institute of Advanced Energy. Kyoto University Gokasho Uji Kyoto 611-0011Japan Joining and Welding Research Institute. Osaka University Ibaraki Osaka567-0047Japan 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2018年第34卷第1期

页      面：209-213页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：support of the National Magnet Confinement Fusion Energy Research Program(Grand No.2013GB108001) 

主　　题：ODS ferritic steel Friction stir welding Recrystallization behavior Electron backscatter diffraction Vickers hardness 

摘      要：Oxide dispersion strengthened （ODS） steels can be used as the structural materials in the future fusion reactors and the fuel cladding materials in the advanced fission reactors. However, the weldability of ODS steels is a severe problem. In the present study, defect-free joints of the 15Cr-ODS ferritic steel were achieved by friction stir welding at different rotation speeds. The recrystallization, hardness and tensile properties are highly related with the rotation speed of the stir tool. The higher rotation speed results in coarser grains in the top SZ, while the grain size exhibits more complicated relation with the rotation speed in the SZ center. The joint welded at 250 rpm exhibits a maximum tensile strength of 974 MPa that reaches about 84% of that of the base metal.