EM42与TC4干摩擦磨损性能的研究

Study on Dry Friction and Wear Characteristic of EM42 Against TC4

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。

The friction and wear characteristics of M42 steel （dry sliding against TC4） were investigated on MMW- 1 high speed and high temperature wear tester under the condition of velocity （0.3-1.58 m/s） and contact load （3.5-6.5 N）. The wear mechanism and tribo-metallographic phases were studied using scanning electron microscopy and X-ray diffraction. The results show that the friction coefficient and wear rate of M42 steel decreases first and then increases with the increase of speed under dry sliding against TC4. Severe plastic deformation and thin lubrication film on the rubbing surface emerge when the friction heat accumulates to a certain value. The ploughing wear, abrasive wear and adhesive wear were founded on the rubbing surface with the load increasing, and the transfer lubrication film forms. The transfer lubrication film chips offwith the thickening of itself. With the increase of load, the friction coefficient shows an earlier decrease and later rises, and the wear rate gradually increases.