20CrNiMo钢在冲击滑动耦合作用下的磨损特性研究

Analysis of Impact-sliding Wear Property of 20CrNiMo Steel

采用L16(45)四水平正交表设计试验,利用自行研制的冲击滑动磨损试验装置研究20CrNiMo钢在冲击滑动耦合作用下的磨损特性,运用极差分析及多元线性回归处理试验数据,得到20CrNiMo钢在冲击滑动耦合作用下的平均磨损质量损失与各试验因素(冲击频率、冲击力和滑动速度)的回归方程,并通过扫描电子显微镜观察分析磨痕表面形貌.结果表明:试验因素对20CrNiMo钢平均磨损量的影响程度由大到小依次为冲击力>冲击频率>滑动速度;平均磨损质量损失随冲击力和冲击频率的增加而增大;20CrNiMo钢在冲击滑动耦合作用下的磨痕表面呈现片状剥落迹象,随着冲击力及冲击频率的增加,片状剥落趋向严重;磨损表层组织在冲击滑动耦合作用下发生较严重的塑性变形而从磨痕边缘挤出、剥落,导致材料流失.20CrNiMo钢在冲击滑动耦合作用下的磨损机制为剥层磨损.

A four levels orthogonal table-L16 （4^5 ） was adopted to 20CrNiMo steel were conducted using impact-sliding wear test rig design the experiments. Impact-sliding wear of which was developed independently. Experiment data were processed through multiple element linear regression and range analysis. Regression equation between average wear mass loss of 20CrNiMo steel and experimental factors, including impact frequency, impact load and sliding velocity, was obtained. Experimental factors affected average wear mass loss in a sequence of contribution as impact load, impact frequency and sliding velocity. Average wear mass loss increased as impact load and impact frequency increasing. Flaking took place at the wear trace and became severity with the impact load and impact frequency increasing. Plastic deformation of sample surface was developed under＇ impact-sliding effect, and materials were extruded through edge of wear trace. The loss of materials was produced by the repetitive process. The wear mechanism of 20CrNiMo steel under impact-sliding condition was explained by delamination theory.