激光表面织构化对GCr15钢摩擦磨损性能的影响  

The Effect of Laser Texturing of GCr15 Steel Surfaces on Their Tribological Properties

作　　者：胡天昌[1,2] 丁奇[1,2] 胡丽天[1] 

机构地区：[1]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000 [2]中国科学院研究生院,北京100039

出　　处：《摩擦学学报》2011年第5期447-451,共5页Tribology

基　　金：国家重点基础研究发展规划项目(973)(2011CB706603)资助~~

摘　　要：本文利用Nd:YAG固体脉冲激光对GCr15钢样品表面进行了微坑织构化处理,考察了激光表面织构参数对其摩擦性能的影响,同时通过扫描电镜等对磨斑表面进行了分析.结果表明:与光滑面试样相比,经织构化处理的样品表面在干摩擦条件下虽然摩擦系数较高,但表现出了较好的抗磨性能;在贫油润滑条件下,织构面的摩擦系数与磨损均明显小于光滑面;在低载低速下较小孔径织构面摩擦系数较小,随着速度及载荷的增大,较大孔径织构面表现出更好的摩擦学性能.采用Stribeck曲线探讨了织构化表面与光滑面在贫油润滑下的润滑机理,结果表明织构面在试验条件下均保持油膜流体润滑状态.The surface textures on GCr15 steel were produced with a solid-state pulse Nd：YAG laser.The effects of laser texturing parameters on tribological performance were investigated.The wear scars were analyzed using scanning electron microscopy.The results show that laser-textured specimens exhibited higher friction coefficients but excellent antiwear properties compared with untextured specimens in dry friction.Under poor lubricated condition,the friction coefficients and wear of textured surfaces were lower than those of untextured surfaces.The friction coefficients of the surface with smaller dimples were lower than those of others under low load at low velocity.However,with the increasing of load the surfaces with larger dimples exhibited lower friction coefficients.Lubrication mechanism was investigated by stribeck curve.It was found that textured surfaces maintained in hydrodynamic regime for all applied loads under poor lubrication.

关 键 词：GCR15钢 激光织构化 STRIBECK曲线 摩擦磨损 

分 类 号：TH117.3[机械工程—机械设计及理论]