Impact of friction stir welding on recrystallization of oxide dispersion strengthened ferritic steel
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2018年第1期
论文作者：Wentuo Han Pingping Liu Xiaoou Yi Qian Zhan Farong Wan Kiyohiro Yabuuchi Hisashi Serizawa Akihiko Kimura
文章页码：209 - 213
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.
Wentuo Han1,2，Pingping Liu1，Xiaoou Yi1，Qian Zhan1，Farong Wan1，Kiyohiro Yabuuchi2，Hisashi Serizawa3，Akihiko Kimura2
1. School of Materials Science and Engineering, University of Science and Technology Beijing2. Institute of Advanced Energy, Kyoto University3. Joining and Welding Research Institute, Osaka University
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.
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