作为结构材料，β钛合金具有优异的比强度、可焊性、抗腐蚀性和冷成形性，因而近来倍受重视．疲劳是实际应用时要考虑的关键因素，但目前很少有β钛合金疲劳性能的数据．在以前的报告中，日本歧阜大学机械和系统工程系的Ｋ．Ｔｏｋａｊｉ等人研究了显微组织在旋转弯曲状态下对? Recently, as a structural material, β titanium alloy has received much attention as it has excellent specific strength, solderability, corrosion resistance and cold formability. Fatigue is a key factor to be considered in practical applications, but there is very little data on the fatigue properties of beta titanium alloys. In a previous report, Kofu University Department of Mechanical and Systems Engineering. Tokaji et al. Studied the microstructure in a rotating and bending state.