激光表面织构对45钢干摩擦性能的影响  

Tribological Influence of Laser Surface Textures on 45 Steel under Dry Sliding

作　　者：常秋英[1] 齐烨[1] 王斌[1] 乔姣飞 

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

出　　处：《机械工程学报》2017年第3期148-154,共7页Journal of Mechanical Engineering

摘　　要：利用LM-YLP-20F-Ⅱ型激光打标机在45钢试件表面加工出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,研究了激光表面织构对不同硬度45钢试件干摩擦磨损性能的影响。考察了激光微坑内部和外部的硬度,利用扫描电镜(SEM)观察了试件的磨损形貌,探讨了激光表面织构对不同硬度45钢试件干摩擦性能的影响机理。研究表明:激光表面织构的几何形貌对摩擦副的干摩擦磨损性能影响显著;在一定条件下,激光表面织构可以改善干摩擦的磨损性能;激光织构化处理会显著改变试件的表面硬度;当试件基体硬度较低时,微坑会支撑保护基体较软的材料,降低粘着磨损;而当基体硬度较高时,高硬度微坑对对偶面的磨粒磨削会增加,从而加剧摩擦副的磨粒磨损。Regular micro-dimples are processed on 45 steel surfaces by a LM-YLP-20F-Ⅱ laser marking machine.Ring-on-block line contact wear and friction tests are conducted under dry sliding in order to study tribological properties of laser surface textures on 45 steel surfaces.The hardness of the inside and outside of dimples are examined,worn surfaces of specimens are observed by SEM,and influence mechanisms of laser surface textures on 45 steel surfaces with different original surface hardness are investigated.The results show that the geometric parameters of laser surface textures have a significant influence on wear resistance under dry sliding,and under certain conditions,laser surface textures can reduce wear loss successfully.Laser texturing will change the surface hardness of specimens drastically.When the original surface hardness of textured specimens is low,laser dimples will sustain and protect materials nearby,thus reduce adhesive wear.However,when the original surface hardness of textured specimens is high,laser dimples will abrade and plough the mating surface seriously,which leads to the increase of abrasive wear.

关 键 词：表面织构 干摩擦 摩擦磨损试验 激光加工 

分 类 号：TH117[机械工程—机械设计及理论]