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.
马核,李菊,王月,李晓红,张田仓,张彦华. 异态TC17 钛合金线性摩擦焊接头微观组织与断裂韧性研究[J]. 航空制造技术, 2022, 65(21): 71-77.
MA He, LI Ju, WANG Yue, LI Xiaohong, ZHANG Tiancang, ZHANG Yanhua. Study on Microstructure and Fracture Toughness of Linear Friction Welded Joint of Bimodal and Basket-Weave TC17 Titanium Alloys[J]. Aeronautical Manufacturing Technology, 2022, 65(21): 71-77.