Study on Fatigue Property of TC11 for Compressor Blade

The influence of temperature on fatigue strength of TC11 titanium alloy was investigated by means of rotary bending fatigue test at different temperatures. It has been found that the fatigue strength of TC11 titanium alloy decreases with temperatures rising within 150—250 ℃, which was attributed to the decrease of the amounts of equiaxed structure and yield and extension strength. Besides, oxidative damage at elevated temperature was another important cause. The results also showed that only surface fatigue crack initiation was found in TC11 titanium alloy at an elevated temperature, and the fatigue crack of subsurface crack initiation was not found.