Microstructure and mechanical properties of inertia friction welded joint of Ti-22Al-25Nb alloy
ZHAO Qiang1, ZHU Wen-hui1, SHAO Tian-wei1, SHUAI Yan-lin1, LIU Jia-tao1, WANG Ran2, ZHANG Li3, LIANG Xiao-bo4
1. Technology Center, AECC Shenyang Liming Aero-Engine Co., Ltd., Shenyang 110043, China;
2. Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education), Northeastern University, Shenyang 110819, China;
3. Shenyang Aerospace University, Shenyang 110136, China;
4. Central Iron & Steel Research Institute, Beijing 100081, China
Abstract：The Ti-22Al-25Nb alloy was welded by inertia friction welded technology. The micros-tructure and microhardness of welded joints before and after heat treatment were studied.The tensile mechanical properties at 650 ℃ and 750 ℃ of welded joints were analyzed. The results show that the weld zone of the as-welded joint consists of B2 phase and a very small amount of residual α2phase. After heat treatment, the weld zone consists of B2 phase and O phase. The O phase is transformed from B2 phase, and there is no composition change during the phase transition process. The microhardness of the as-welded zone is higher than that of the base material. After heat treatment at 780 ℃ for 3 h, the microhardness of the welded zone increases significantly due to the precipitation of fine O phase. But the microhardness of the welded zone with heat treatment at 800 ℃ for 3 h is between that of the as-welded state and the heat treatment at 780 ℃ for 3 h. The specimen of high temperature tensile fracture in the base material, and the tensile fracture morphology presents ductile fracture feature with many small shallow dimples.
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2020, Vol. 48 
