摘要
为了探索激光冲击20CrNiMo钢表面微造型摩擦学性能,从表层微观结构和表面宏观形貌两个角度,研究了激光冲击强化的方法对20CrNiMo钢表面摩擦磨损性能的影响。采用激光以不同搭接率搭接冲击20CrNiMo钢,用透射电子显微镜观察激光搭接冲击20CrNiMo钢试样表层微观组织结构,取得了试样表层晶粒状态的照片;采用CETR UMT摩擦磨损试验机对其进行摩擦磨损试验,取得了试样表面摩擦系数和磨损量的数据。结果表明,激光冲击强化作用可以导致20CrNiMo钢试样表层晶粒细化,在磨损过程中,晶粒细化层明显抑制表面疲劳磨损的产生,从而提高其耐磨性能;激光冲击搭接率越高,金属材料表面的摩擦磨损性能越好。
In order to study tribological behaviors of surface micro-forming 20CrNiMo steel under laser shock processing （LSP） , the effects of LSP on the friction and wear behaviors of 20CrNiMo steel were investigated through observing microstructure and measuring the macro-surface profile. Firstly, 20CrNiMo was impacted by overlapping LSP in different overlap ratio, and then micro-structure of surface layer was observed through transmission electron microscope, finally, the pictures for surface layer grain state were obtained. Friction and wear test was conducted by CETR UMT Tribometer, surface friction coefficient and wear volume was obtained. The results indicate that grain refinement happens in the surface layer due to LSP impacting 20CrNiMo. Friction and wear behaviors can be improved obviously because fine grain in the grain refinement layer can restrain fatigue wear on lubricated sliding wear process effectively.
出处
《激光技术》
CAS
CSCD
北大核心
2012年第6期814-817,共4页
Laser Technology
基金
江苏省自然科学基金资助项目(BK2010288)
江苏省光子制造科学与技术重点实验室资助项目(GZ200901)
关键词
激光技术
摩擦磨损
晶粒细化
搭接率
微凹坑
laser technique
friction and wear
grain refinement
overlap ratio
micro-dimple
