微纹理覆盖率对铬镍合金表面摩擦磨损性能的影响

Effect of Micro-texture Coverage on the Surface Friction and Wear Performance of Cr-Ni Alloy

为探明非规则且离散分布的微凹坑和微沟槽表面纹理覆盖率对铬镍合金表面油润滑摩擦性能的影响,采用强化研磨加工技术在铬镍合金表面制备微凹坑和微沟槽,利用往复式直线摩擦磨损试验机测试各试样的抗摩擦磨损性能。采用白光干涉仪和扫描电子显微镜观察试样表面前后显微形貌及粗糙度,采用Matlab计算各试样表面前后微凹坑覆盖率。通过磨痕形貌分析研究微纹理覆盖率与抗磨性能变化的关系。结果表明:在油润滑往复式摩擦磨损条件下,试样摩擦系数随非规则微凹坑表面纹理覆盖率增加而先下降后上升;当表面纹理覆盖率为12.61%时,试样表面微凹坑最均匀,摩擦性能最优,磨损率和平稳阶段摩擦系数分别降低了51.97%和15.05%;强化研磨加工形成的均匀微凹坑和微沟槽纹理可增强铬镍合金表面摩擦性能。

To investigate the effect of irregular and discrete surface texture coverage of micro-pits and micro-grooves on the lubrication and tribological properties of inconel surface oil,micropits and grooves were prepared on the surface of inconel alloy by intensive grinding technology.The friction and wear resistance of the samples was tested by reciprocating linear friction and wear testing machine.White light interferometer and scanning electron microscope were used to observe the surface morphology and roughness of the samples,and Matlab was used to calculate the coverage of micro pits on the surface of each sample.The relationship between the microtexture coverage and the wear resistance was studied by the wear morphology analysis.The results show that under the condition of reciprocating friction and wear of oil lubrication,the friction coefficient of the sample decreases first and then increases with the increase of the coverage of irregular micro-pits.When the surface texture coverage rate is 12.61%,the micro-pits on the sample surface are the most uniform,and the friction performance is the best.The wear rate and the friction coefficient in the smooth stage are reduced by 51.97%and 15.05%.The surface tribological properties of inconel alloy can be enhanced by the uniform micro-pits and micro-grooves formed by intensified lapping.