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| Study on Microstructure and Fracture Toughness of Linear Friction Welded Joint of Bimodal and Basket-Weave TC17 Titanium Alloys |
| MA He1, LI Ju2,3, WANG Yue1, LI Xiaohong2,3, ZHANG Tiancang2,3, ZHANG Yanhua1 |
1. Beihang University, Beijing 100191, China;
2. Aeronautical Key Laboratory for Welding and Joining Technologies, AVIC Manufacturing Technology Institute, Beijing 100024, China;
3. Beijing Friction Welding Technology and Equipment Engineering Center, Beijing 100024, China |
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Abstract The microstructure and fracture toughness of a bimodal and basket-weave TC17 titanium alloys linear friction welded joint were investigated to meet the manufacturing demands of titanium alloy dual-performance blisk. Metallographic examination reveals that fine-grains with metastable phases are formed in the welding zone (WZ), thermoplastic deformed microstructures with partially dissolved primary αp phases are formed in the thermo-mechanical affected zone (TMAZ). Fracture toughness examination shows that the fracture toughness of the WZ and TMAZ is significantly lower than that of the base metals, resulting in an obvious brittle tendency of the joint. However, the postweld annealing heat treatment can decompose the metastable phases into the equilibrium α+β phases in the joint, which can alleviate the brittle tendency of the joint to a certain extent.
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2022, 
