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采用CO2激光器在45钢基体表面熔覆稀土氧化物La2O3的Fe基涂层;借助于扫描电镜(SEM)、X射线衍射仪(XRD)、能谱仪(EDS)、显微硬度计、ML-100型磨粒磨损试验机对涂层组织结构、物相、组成成分、硬度及耐磨性能进行了分析。结果表明,添加稀土能够减少甚至消除Fe基合金涂层中存在的孔洞,细化晶粒,提高致密性;涂层的硬度和磨损形貌表明,添加稀土能够小幅度地提高涂层的硬度,但能够使涂层表面的硬度值比较均匀一致,从而引起磨损表面的相对光滑。Fe基合金涂层的磨损机理为轻微的磨粒磨损,45钢的磨损机理为磨粒磨损与粘着磨损。
A Fe-based coating of rare earth oxide La2O3 was coated on the surface of 45 steel by CO2 laser. The microstructure of the steel was characterized by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectrometer 100 abrasive wear tester for the coating structure, phase, composition, hardness and wear resistance were analyzed. The results show that the addition of rare earth can reduce or even eliminate the existing pores in the Fe-based alloy coating, refine the grains and improve the compactness. The hardness and wear morphology of the coating show that the addition of rare earth can slightly increase the hardness of the coating, But can make the coating surface hardness values more uniform, resulting in the wear surface is relatively smooth. The wear mechanism of Fe-based alloy coating is slight abrasive wear, the wear mechanism of 45 steel is abrasive wear and adhesive wear.