The microstructure and mechanical properties of friction stir welded Ti6Al4V titanium alloy under β transus temperature

Shude Ji, Bin Zhuo, Shuangsheng Gao, Yongxian Huang, Liguo Zhang, Jizhong Li, Yinan Ma

Abstract


Ti6Al4V titanium alloy is friction stir welded using a W-Re rotational tool. The effects of welding speed on the microstructure, tensile strength and fracture properties of weld are investigated. At the rotational velocity of 250 r/min, the peak temperature is lower than β transus temperature, and the weld nugget is made up of fine α phase and transformed β phase. The grain size of shoulder affected zone is bigger than that of weld nugget because of low thermal conductivity of Ti6Al4V titanium alloy. By increasing the welding speed, the grain size of weld nugget, the tensile strength and the ductility of weld all are decreased.

Keywords


friction stir welding; Ti6Al4V titanium alloy; microstructure; tensile strength

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ISSN 1330-9587 (Print), ISSN 1849-0433 (Online)

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