Abstract

Titanium alloys are widely used in high precision fields due to their excellent physical and chemical properties. However, titanium alloys exhibit poor machinability and are prone to tool wear and tear during processing, thereby resulting in low service life. Recent studies have indicated that it is possible to reduce the friction and wear between two contact surfaces by placing a micro-texture on the smooth surface. Nevertheless, there is a lack of research on the mechanism of friction reduction and wear resistance of micro-texture. With respect to YG8 and Ti6Al4V, which are commonly used in high-precision cutting, different types of micro-textures are placed on the YG8 surface. The friction and wear processes of YG8 disc specimen and Ti6Al4V ball specimen are simulated and experimented, and the results indicate that the micro-pit texture exhibits the best antifriction and anti-wear properties. Single-factor experiments were performed on different texture parameters of micro-pits, and the effects of micro-pit diameter, micro-pit spacing and micro-pit depth on friction reduction and anti-wear properties of micro-pit texture were obtained. Finally, the anti-wear and anti-friction mechanism of the micro-pit texture was obtained by combining the experimental results with the energy spectrum analysis of ball and disc specimens.

摘要

钛合金以其优异的物理化学性能被广泛应用于高精度领域。然而，钛合金的切削加工性较差，加工过程中容易出现刀具磨损，从而导致使用寿命低。最近的研究表明，可以通过在光滑表面上放置微纹理来减少两个接触表面之间的摩擦和磨损。然而，目前还缺乏对微织构减摩和耐磨机理的研究。对于常用于高精度切割的YG8和Ti6Al4V，在YG8表面上放置了不同类型的微纹理。对YG8圆盘试件和Ti6Al4V球试件的摩擦磨损过程进行了模拟试验，结果表明，微坑纹理表现出最好的减摩和抗磨性能。对微坑的不同织构参数进行单因素试验，得到微坑直径、微坑间距和微坑深度对微坑织构减摩抗磨性能的影响。最后，将实验结果与球盘试样的能谱分析相结合，得到了微坑纹路的抗磨减摩机理。