【摘要】 根据钛合金双性能整体叶盘制造的需要，研究了异态（双态组织与网篮组织）TC17钛合金线性摩擦焊接头的微观组织与断裂韧性。结果表明，接头焊合区（WZ）为剧烈破碎的含亚稳定相细晶组织，热力影响区（TMAZ）为热塑性变形组织，且部分初生α_p相发生了溶解。焊态接头WZ与TMAZ的断裂韧性与母材相比有较大幅度降低，产生了明显的脆性倾向，而焊后退火热处理可使接头中的亚稳定相分解并形成平衡态α+β组织，可在一定程度上缓解接头的脆性倾向。更多还原

【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.更多还原