Texture of friction stir welded Ti-6Al-4V alloy
(1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;
2. Shandong Provincial Key Laboratory of Special Welding Technology,
Harbin Institute of Technology at Weihai, Weihai 264209, China;
3. Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150001, China)
2. Shandong Provincial Key Laboratory of Special Welding Technology,
Harbin Institute of Technology at Weihai, Weihai 264209, China;
3. Center for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150001, China)
Abstract: The α+β titanium alloy, Ti-6Al-4V, was welded by friction stir welding using a W-Re pin tool, and the defect-free weld was produced with proper welding parameters. Texture of the Ti-6Al-4V friction stir weld was studied by orientation imaging microscopy. The as-received Ti-6Al-4V sheet mill annealed was composed of elongated primary α and transformed β. A typical rolling texture was observed in the base material. The microstructure of the stir zone was significantly different from that of the base material. The stir zone was characterized by the presence of considerable amount of equiaxed dynamically recrystallized grains and a texture around {j？？=30°, f=62°, j2？=30°} was developed during the friction stir welding.
Key words: friction stir welding; titanium alloy; texture; orientation imaging microscopy