激光表面织构化对316L不锈钢摩擦学行为的影响

Effect of Laser Surface Texturing(LST)on Tribological Behavior of 316L Stainless Steel

采用激光加工技术在316L不锈钢表面形成矩阵分布的凹坑织构,以凹坑织构的形状、面积和间距等几何参数为因素建立正交实验表,研究激光表面织构化对316L不锈钢摩擦学行为的影响。利用极差和方差分析方法分析表面织构化316L不锈钢的磨损失重规律,利用扫描电子显微镜观察表面织构化316L不锈钢的表面和磨痕形貌。结果表明:表面织构化316L不锈钢试样的摩擦系数高于表面抛光316L不锈钢,这是激光表面织构化增大了表面粗糙度所致;但表面织构化试样的磨损失重明显低于表面抛光试样,这可归因于表面织构能起到捕捉磨屑、减小摩擦接触面积的作用,显著提高了316L不锈钢的耐磨性。

Dimple surface texture with a matrix-distribution was prepared on the surface of 316L stainless steel by laser processing technology.Orthogonal experiment was established by taking as facters the geometrical parameters of dimple shape,area,and interval between two dimples.The effect of laser surface texturing on the tribological behavior of 316L stainless steel under dry friction was investigated.Range and variance analysis were used to analyze the mass loss of 316L stainless steel.The surface and worn morphologies of surface textured 316L stainless steel were characterized by scanning electron microscopy.The results show that the friction coefficients of surface textured 316L stainless steels were higher than that of the polished 316L stainless steel,which was attributed to the increase of surface roughness after laser processing.However,the mass loss values of surface textured 316L stainless steel samples were significantly lower in comparison with the polished 316L stainless steel because the obtained surface texture provided positive effects of capturing wear debris and reducing friction contact area,thus contributing to significant improvement in wear resistance of 316L stainless steel.