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| ZHAO Qiang1 , ZHU Wenhui1 , SHUAI Yanlin1 , LIU Jiatao1 , ZHANG Li2 , WANG Ran3 , SHANG Zhen1 , LIU Yue1 |
| (1. Technology Center, AECC Shenyang Liming Aero-Engine Co., Ltd., Shenyang 110043, China; 2. School of Material Science and Engineering, Shenyang Aerospace University, Shenyang 110136, China; 3. Key Laboratory for Anisotropy and Texture of Materials （Ministry of Education）, Northeastern University, Shenyang 110819, China) |
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Abstract Ti2AlNb alloy was welded by inertia friction welding. The microstructure changes of welded joints under welded condition and after different heat treatments were analyzed. The influence of different heat treatments on the microstructure of inertia friction welded joints of Ti–22Al–25Nb alloy was studied. The results show that the Ti–22Al– 25Nb alloy welded joint without defect and with weld in good condition can be obtained by inertial friction welding. The change of the number and size of O phase in the welding zone is determined by the temperature and duration of heat treatment. However, compared with the change of duration, the change of temperature during heat treatment has a more remarkable influence on O phase. After heat treatment at temperature between 780℃ and 850℃ , the growth range of O phase in the welding zone is small, and the size after growth is still far smaller than that of the base material. The evolution of O phase in thermo-mechanically affected zone is the same as that in welding zone. With the increasing of heating temperature and prolonging of heating time, O phase in HAZ coarsens, while α2 phase is of no change.
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2021, 
