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J. Mater. Sci. Technol.  2018, Vol. 34 Issue (1): 209-213    DOI: 10.1016/j.jmst.2017.11.032
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Impact of friction stir welding on recrystallization of oxide dispersion strengthened ferritic steel
Wentuo Hanab*(), Pingping Liua, Xiaoou Yia, Qian Zhana, Farong Wana, Kiyohiro Yabuuchib, Hisashi Serizawac, Akihiko Kimurab
a School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China
b Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan
c Joining and Welding Research Institute, Osaka University, Ibaraki, Osaka, 567-0047, Japan
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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.

Key words:  ODS ferritic steel      Friction stir welding      Recrystallization behavior      Electron backscatter diffraction      Vickers hardness     
Received:  01 April 2017     
Corresponding Authors:  Han Wentuo     E-mail:

Cite this article: 

Wentuo Han, Pingping Liu, Xiaoou Yi, Qian Zhan, Farong Wan, Kiyohiro Yabuuchi, Hisashi Serizawa, Akihiko Kimura. Impact of friction stir welding on recrystallization of oxide dispersion strengthened ferritic steel. J. Mater. Sci. Technol., 2018, 34(1): 209-213.

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Material C Cr W Ti Y2O3 Fe
15 Cr-ODS 0.02 14.9 1.9 0.2 0.34 Bal
Table 1  Chemical compositions of the 15Cr-ODS ferritic steel (wt%).
Fig. 1.  Specimen for tensile tests: (a) specimen dimension; (b) cutting position of specimen in welded joint.
Fig. 2.  Hardness distribution in the joint welded at different rotational speeds: (a) 250 rpm; (b) 300 rpm; (c) 350 rpm; (d) 400 rpm.
Fig. 3.  SEM observations in the joint welded at 300 rpm: (a) base metal; (b) stir zone.
Fig. 4.  EBSD observations in the joint welded at 300 rpm: (a) base metal; (b) stir zone.
Fig. 5.  Grain morphology of the top stir zone.
Fig. 6.  Grain morphology of the stir zone center.
Fig. 7.  Tensile properties tested at room temperature: (a) stress-strain curves; (b) plotted data of the ultimate tensile strength (UTS) and total elongation.
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