脂润滑工况下GCr15钢的冲击磨损实验研究

Experimental Study on Impact Wear of GCr15 Steel with Grease Lubrication

在重载荷冲击磨损试验机上在一定冲击频率下对GCr15钢试件进行脂润滑工况下的冲击磨损试验,使用扫描电镜以及表面形貌仪等观察分析试件表面损伤及塑性变形情况。结果发现:冲击使GCr15钢试件表面发生了塑性变形和磨损,塑性变形存在于冲击的每一阶段,不同润滑脂接触工况下表层脱落情况不相同,并且伴有微细球形颗粒产生;冲击次数较少时,润滑脂黏度越大,冲击磨损后试件表面凹坑深度越大,形成的凹坑肩部凸起越高,随着冲击次数的增加,不同脂润滑时的凹坑深度趋于相同。

Using a self-made impact test rig of heavy load, under working condition of lubricated contacts with greases, the impact wear experiments of a steel ball on a GCr15 steel sample were carried out at certain impact rate. The damage behaviors of the surfaces of samples and plastic deformation were analyzed and observed with the Scan Electronic Microscope（SEM） and surface profiler. The results indicate that the surface of GCr15 steel has undergone plastic deformation and wear by impacting, with plastic deformation existing in each stage of the impact. The losses of surface layer under different contact conditions are different, accompanying with the formation of small spherical particles. When the number of impact times is small, the larger viscosity of the grease has, the greater the depth of dent and the higher the shoulder bump of dent forming after impact wear will be. Along with increasing of the number of impact times, the depths of the dents using different greases tend to be identical.