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Original scientific paper

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

Shude Ji ; Faculty of Aerospace Engineering, Shenyang Aerospace University, No. 37 Daoyi South Avenue, Daoyi Development District, Shenyang 110136, China
Bin Zhuo ; Faculty of Aerospace Engineering, Shenyang Aerospace University, No. 37 Daoyi South Avenue, Daoyi Development District, Shenyang 110136, China
Shuangsheng Gao ; Faculty of Aerospace Engineering, Shenyang Aerospace University, No. 37 Daoyi South Avenue, Daoyi Development District, Shenyang 110136, China
Yongxian Huang ; State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, No. 92 West Dazhi street, Nangang District, Harbin 100024, China
Liguo Zhang ; Faculty of Aerospace Engineering, Shenyang Aerospace University, No. 37 Daoyi South Avenue, Daoyi Development District, Shenyang 110136, China
Jizhong Li ; Beijing Aeronautical Manufacturing Technology Research Institute, No. 1 Dongjun Village, Chaoyang District, Beijing 100024, China
Yinan Ma ; Faculty of Aerospace Engineering, Shenyang Aerospace University, No. 37 Daoyi South Avenue, Daoyi Development District, Shenyang 110136, China


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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

Hrčak ID:

133246

URI

https://hrcak.srce.hr/133246

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