激光织构对干摩擦性能的影响及机理研究  

Research on Tribological Behaviors of Laser Surface Textures under Dry Sliding

作　　者：齐烨[1] 常秋英[1] 王斌[1] 李娟[2] 

机构地区：[1]北京交通大学机械与电子控制工程学院,北京100044 [2]中国兵器科学研究院,北京100089

出　　处：《兵工学报》2015年第2期200-205,共6页Acta Armamentarii

基　　金：国家自然科学基金项目(51075026);总装备部预先研究项目(62501036025)

摘　　要：采用LM-YLP-20F-Ⅱ型激光打标机进行表面织构化处理,形成具有规则排列的圆形微坑阵列。通过环-块线接触摩擦磨损试验,研究了不同面密度的激光表面织构对干摩擦磨损性能的影响,采用探针轮廓仪和扫描电镜对试件的表面形貌进行了分析。建立了摩擦副的简化接触有限元模型,模拟摩擦副的滑动摩擦过程,从应力的角度分析表面织构对干摩擦性能的影响机理。试验结果表明:激光表面织构化对试件表面硬度影响显著;当激光织构面密度小于20%时,构成摩擦副的两试件的磨损量都小于无织构情况;当织构面密度大于20%时,与无织构情况相比,织构化试件的磨损仍降低,但对偶件的磨损反而增大。仿真结果表明:对织构化试件的对偶件来说,在一定的织构面密度范围内,在平均应力无大幅提高的前提下,织构凹坑的存在,缓解了接触区应力集中现象,从而有利于降低磨损。Surface of specimen is textured with a LM-YLP-20F-Ⅱ laser marking machine to develop regu- larly arranged micro-dimples. Ring-block line contact friction tests are performed to study the influence of laser textures＇ area density on friction and wear behaviors under dry sliding. The morphologies of textures are examined with a stylus profiler and a scanning electron microscope. A simplified finite element contact model of friction pair with surface textures is developed to simulate sliding friction, and the stress distribution is obtained to analyze the effects of surface textures on tribological properties. The results show that the effect of laser surface texturing on the surface hardness of specimen is remarkable. Both the wear losses of two mating specimens are reduced compared with non-textured specimens when the area density of laser surface textures is less than 20% , and the wear rate of textured specimen still goes down. However the wear rate of the mating specimen goes up when the area density of laser surface textures is over 20%. High stress location and magnitude shift with the change in the dimples on contact surfaces, which is beneficial to wear resistance.

关 键 词：材料表面与界面 磨损 激光表面织构 干摩擦 有限元仿真 

分 类 号：TH117.1[机械工程—机械设计及理论]