316L不锈钢沟槽型表面微织构减摩特性实验研究∗

摘要

采用激光微加工技术在316L不锈钢光滑表面上进行沟槽型织构化处理。在往复式摩擦磨损试验机上利用柱-平面接触方式对沟槽型织构和光滑表面进行摩擦磨损对比实验，重点考察了激光表面织构参数对其摩擦性能的影响，同时通过扫描电子显微镜对磨斑形貌进行了分析。结果表明，与未织构试样相比，织构化表面的摩擦因数均有不同程度减小且表现得更为稳定、磨损相对轻微，这是由于所制备的表面微坑起到了储存润滑介质并捕获磨屑的作用；织构条纹的结构参数对摩擦磨损有重要影响，随着沟槽宽度和沟槽间距的增大，摩擦因数均呈先下降后上升的趋势，而当沟槽宽度为100μm 和沟槽间距为200μm 时减摩抗磨性能最佳；此外，研究表明接触载荷对织构化表面摩擦因数的影响较小，织构化处理对高负载环境下的减摩抗磨性能影响更加显著。%The groove-textured surfaces were manufactured on 316L stainless steel by using laser surface micro-machining technology.The effects of texturing parameters on tribological performance were investigated by comparison to the original smooth surfaces with a pin-on-flat configuration,by using a new-developed reciproca-ting sliding friction and wear experimental apparatus.The wear scars were analyzed using scanning electron mi-croscopy.The test results show that the groove-textured specimens exhibited lower and stable friction coeffi-cient as compared with untextured specimens,and textured surfaces damage was relative slight than that of un-textured specimens.It was found that micro-grooves acted an important function as retain lubricating medium and capture debris particles.The friction coefficient exhibited an ascent trend after an initial decline,with the increase of the width and distance of the grooved surface texture.In this work,an optimum parameters has been acquired for better friction reduction and antiwear properties,that is,when the width and distance of the grooved surface texture is 100 and 200μm,respectively.In addition,it was also found that the normal load had a little influence on friction coefficient of the groove-textured surfaces,however,for the high-load conditions, the friction reduction and antiwear properties was more significant.