摘要
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。
The influence of temperature on fatigue strength of TC11 titanium alloy was investigated by means of rotary bending fa- tigue 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 sur- face fatigue crack initiation was found in TCll titanium alloy at an elevated temperature, and the fatigue crack of subsurface crack initiation was not found.
出处
《材料开发与应用》
CAS
2016年第3期22-27,共6页
Development and Application of Materials
基金
技术基础项目(Z082012T001)
关键词
钛合金
高温疲劳
等轴组织
疲劳裂纹
titanium alloy
high temperature fatigue
equiaxed structure
fatigue crack
