激光喷丸灰铸铁表面摩擦性能的改善研究  

Research on Improving Friction Performance of Grey Cast Iron by Laser Peening

作　　者：冯旭[1] 周建忠[1] 王建军[1] 

机构地区：[1]江苏大学机械工程学院,江苏镇江212013

出　　处：《应用激光》2015年第5期521-524,共4页Applied Laser

基　　金：国家自然科学基金资助项目(项目编号:51175236);国家自然科学基金资助项目(项目编号:51575247);江苏省研究生科研创新资助项目(项目编号:1011110008)

摘　　要：基于不同的应用背景,通常需要材料表面提供或高或低的摩擦系数,激光喷丸表面造型是改善材料摩擦性能的有效方法之一。通过激光喷丸的方法,采用不同的激光能量在灰铸铁表面制备具有不同深径比的微凹坑阵列,讨论了激光喷丸的原理,研究了微凹坑的表面形貌,并在干摩擦和润滑条件下使用UMT-2摩擦磨损试验仪分别对喷丸前后的试样表面进行了摩擦磨损实验。结果表明,喷丸试样的摩擦系数明显异于未喷丸试样且磨损量明显降低,可适用于各种不同的工程应用场合。According to different application, some high or low friction coefficient of the material surface is required. Laser peening （LP） is an effective way to improve the friction performance of material by fabricating high quality micro dents on its surface. In this study, micro-dent arrays were fabricated on grey cast iron specimens by a set of LP experiments under different laser energy, with different patterns in terms of the depth over diameter. The mechanism of LP was discussed and surface morphology of the micro dent was investigated. The tests under the conditions of dry and lubricating sliding friction were accomplished on the UMT-2 apparatus. The results showed that friction coefficient of LPed samples were obvious changed than smooth sample and the wear mass losses of the LPed specimens are all lower than those of untreated specimen. It can be applied to a variety of engineering applications.

关 键 词：微凹坑 激光喷丸 摩擦性能 

分 类 号：TN249[电子电信—物理电子学]