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在不同温度对TC11钛合金进行旋转弯曲疲劳性能测试及组织形貌观察,研究了温度对合金疲劳行为的影响。结果表明,在150—250℃,合金的旋转弯曲疲劳强度随着温度的升高而降低。随着温度的升高,合金的屈服与抗拉强度降低,等轴组织的含量也降低,这是合金疲劳强度降低的主要原因。高温下合金的疲劳裂纹从表面萌生,未发现内部萌生的特征。
At different temperatures, the TC11 titanium alloy was subjected to rotational bending fatigue test and microstructure observation. The effect of temperature on the fatigue behavior of the alloy was studied. The results show that at 150-250 ℃, the fatigue strength of the alloy decreases with increasing temperature. As the temperature increases, the yield and tensile strength of the alloy decrease, and the content of the equiaxed structure also decreases, which is the main reason for the decrease of the fatigue strength of the alloy. Fatigue cracks at the surface of the alloy occurred at high temperatures, and no internal sprouts were found.