Q235材料激光凹坑织构表面的摩擦磨损特性

Friction and Wear Properties of Laser Dimple Textured Surface of Q235 Material

采用脉冲激光在碳素结构钢试件表面加工出凹坑织构,测试了激光凹坑边缘的硬度,通过销盘磨损实验,分析激光凹坑试件表面的摩擦磨损特性,观察了磨损表面形貌,并与普通试件进行了对比。结果表明:激光加工试件的凹坑边缘硬度提高,磨损量降低。激光加工凹坑表面的磨损机制以磨粒磨损为主。激光凹坑边缘硬质点的支撑和保护作用,以及凹坑的磨屑存储作用,减少了激光凹坑试件的磨粒磨损程度。激光凹坑织构改变了摩擦副之间的接触性能,减少黏着结点的形成概率,可以降低黏着磨损。激光加工凹坑表面具有降低磨粒磨损和黏着磨损的作用,从而提高激光凹坑织构试件表面的耐磨性。

Textured dimples were fabricated on Q235 material specimen surface. Surface hardness was measured. Pin-on-disk wear tests were carried out and worn surfaces were observed to analyze the tribological properties of laser dimple surface. Laser dimple specimen was compared with common specimen. Experimental results show that. laser dimple specimen has higher hardness of laser dimple edge and lower wear than common specimen. Wear mechanism of laser dimple surface is adhesive wear. The bearing effect of laser hardened dimple edges and wear debris trapping func- tion of dimples can decrease abrasive wear of laser dimple specimen. Laser textured dimple can change the contacting state of friction pair, decrease the probability of adhesive points forming. The adhesive wear of laser dimple specimen can be reduced. Laser dimple surface can decrease abrasive and adhesive wear, and can improve the wear resistance of laser dimple textured specimen.