(北京有色金属研究总院 有色金属材料制备加工国家重点实验室，北京 100088)
摘 要: 采用示波冲击法，对750、920、940和960 ℃这4种加热温度下分别采用炉冷、空冷、水冷等不同冷速的TC4钛合金的动态断裂韧性进行测试，结合金相组织观察及扫描电镜断口形貌观察，分析相组成对TC4钛合金动态断裂韧性的影响。结果表明：在所涉及的加载速率范围内，等轴α相含量为47%~50%，次生α相片层呈短棒状，具备上述特征的空冷(α初+β转)组织TC4合金具有较好的动态断裂性能。
关键字: TC4钛合金；动态断裂韧性；示波冲击法
TC4 titanium allo
（State Key Laboratory for Fabrication and Processing of Nonferrous Metals,
General Research Institute for Nonferrous Metals, Beijing 100088, China）
Abstract:TC4 titanium alloys were heat treated under cooling conditions of furnace/air/water quenching at 750, 920, 940 and 960 ℃ to investigate dynamic fracture toughness by instrumented impact method. Combined with analysis of both metallography and fractograph, the influence of volume fraction, of equiaxed α phase and shape of secondary α phase on dynamic fracture toughness was studied. The results show that the volume fraction of equiaxed α phase in 47%−50% and short rod-like secondary α phase lead to relatively good dynamic fracture toughness for TC4 titanium alloy with (primary α+β trans) microstructure under dynamic loading condition.
Key words: TC4 titanium alloy; dynamic fracture toughness; instrumented impact method
