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在MMW-1高温高速摩擦试验机上进行M42高速钢的高速干滑动摩擦磨损试验。利用SEM观察并分析磨损形貌及磨损机理。结果表明:M42高速钢在与TC4钛合金配副干摩擦条件下,随着摩擦速度的增加,摩擦因数和磨损率先降低后升高。当摩擦热累积达到一定值后,摩擦表面产生严重塑性变形甚至形成润滑薄膜。随着载荷的增加,摩擦表面起初产生犁沟磨损、磨粒磨损和粘着磨损,形成转移润滑膜,该膜厚度增加并被带走脱落;摩擦系数先降低然后升高,磨损率随着载荷的增加而逐渐上升。
High-speed dry sliding friction and wear test of M42 high-speed steel was carried out on MMW-1 high temperature and high speed friction tester. The wear morphology and wear mechanism were observed and analyzed by SEM. The results show that the friction coefficient and wear rate of M42 high-speed steel first decrease and then increase with the increase of friction speed under the condition of secondary dry friction with TC4 titanium alloy. When the friction heat accumulation reaches a certain value, the friction surface has a serious plastic deformation or even the formation of lubricating film. As the load increases, the friction surface initially produces furrow wear, abrasive wear, and adhesive wear, forming a transfer-lubricating film that increases in thickness and is taken off; the friction coefficient decreases first and then increases, and the wear rate increases with load Increase and gradually increase.