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本文对高强钛合金Ti-10V-2Fe-3Al在不同温度下的微动损伤和疲劳特性进行了研究。试验结果表明,该合金对微动损伤十分敏感,常温疲劳强度下降达50％。微动损伤的主要机制是疲劳脱层,这是由作用在材料次表层的交变切应力引起的,它将导致疲劳裂纹的萌生和早期断裂。疲劳裂纹的扩展方向可根据接触应力分析得到解释。在较高试验温度下,由于接触面形成的氧化层的保护作用,微动损伤程度减弱。
In this paper, the fretting damage and fatigue properties of high strength titanium alloy Ti-10V-2Fe-3Al at different temperatures were studied. The test results show that the alloy is very sensitive to fretting damage, and the fatigue strength at room temperature is reduced by 50%. The main mechanism of fretting damage is fatigue delamination, which is caused by alternating shear stress acting on the subsurface of the material, which leads to the initiation and early rupture of fatigue cracks. The direction of fatigue crack propagation can be explained by contact stress analysis. At higher test temperatures, fretting damage is attenuated due to the protective effect of the oxide layer formed on the contact surface.