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J. Mater. Sci. Technol.  2016, Vol. 32 Issue (4): 326-333    DOI: 10.1016/j.jmst.2015.10.009
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Effect of Rotation Rate on Microstructure and Mechanical Properties of Friction Stir Spot Welded DP780 Steel
G.M. Xie, H.B. Cui, Z.A. Luo, W. Yu, J. Ma, G.D. Wang
State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
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Abstract  DP780 steel sheets consisting of ferrite and martensite were successfully friction stir spot welded (FSSW) at the rotation rates of 500 to 1500 r/min using a W-Re alloy tool. The effect of rotation rate on microstructure and mechanical properties of the FSSW DP780 was investigated. The peak temperatures in the welds at various rotation rates were identified to be above A3 temperature. FSSW caused the dynamic recrystallization in the stir zone (SZ), thereby producing the fine equiaxed grain structures. At the higher rotation rates of ≥1000 r/min, a full martensitic structure was observed throughout the SZs, whereas at the lower rotation rate of 500 r/min, the SZ consisted of a fine dual phase structure of ferrite and martensite due to the action of deformation induced ferrite transformation. The maximum average failure load as high as 18.2 kN was obtained at the rotation rate of 1000 r/min and the fracture occurred at the thinned upper sheet.
Key words:  Friction stir spot welding      Dual phase steel      Microstructure      Deformation induced ferrite transformation      Mechanical property     
Received:  10 April 2015     
Fund: This work was supported by the National Natural Science Foundation of China (No. 51001023), the Fundamental Research for the Chinese Central Universities (No. N120407004) and the National High Technology Research and Development Program of China (No. 2015AA03A501). The authors are particularly grateful to Prof. R.D. Liu, the Ansteel Group Co., China, for providing the experimental materials.
Corresponding Authors:  Tel.: +86 24 83673172; Fax: +86 24 23906472.   

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G.M. Xie, H.B. Cui, Z.A. Luo, W. Yu, J. Ma, G.D. Wang. Effect of Rotation Rate on Microstructure and Mechanical Properties of Friction Stir Spot Welded DP780 Steel. J. Mater. Sci. Technol., 2016, 32(4): 326-333.

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