稀土在激光熔覆中可改善激光熔覆层的组织和性能，研究了添加质量分数为 1.0% 的稀土氧化物 Y2O3对激光熔覆 Fe60 涂层显微组织和摩擦学性能的影响。 使 用 激光 熔 覆 技术 在 16Mn 基板表面制备了 Fe60 涂层和Fe60-Y2O3 涂层；采用 XRD 、 OM 、 SEM 、 EDS 对比分析了 Fe60 涂层和 Fe60-Y2O3 涂层的显微组织；通过维氏硬度计、摩擦磨损试验机、 3D 形貌仪和 SEM 研究了两种涂层的显微硬度、摩擦学性能和磨损机理。 结果表明，与 Fe60 涂层相比，Fe60-Y 2 O 3 涂层的二次枝晶臂间距为 2.925 μm ，减小了 17.4% ；截面显微硬度为 701 HV 0.3 ，提高了 9.5% ；摩擦系数为0.312 ，降低了 40.3% ；体积磨损率为 2.36×10 -5 mm 3 /(N · m) ，降低了 30.8% 。 可见， Fe60-Y 2 O 3 涂层具有细化的显微组织、更高的显微硬度、更低的摩擦系数和更好的抗磨损性能。

Rare earth can improve the microstructure and properties of the laser cladding layer in laser cladding. In this paper, the effects of rare earth Y2O3 with a mass fraction of 1.0% on the microstructure and tribological properties of a laser cladding Fe60 coating were studied. First, an Fe60 coating and Fe60-Y2O3 coating were prepared on the surface of a 16Mn substrate by laser cladding. Then, the microstructure of both the Fe60 coating and Fe60-Y2O3 coating was analysed by XRD, OM, SEM and EDS. Finally, the microhardness, tribological properties and wear mechanism of the two coatings were studied by a Vickers hardness tester, friction and wear tester, 3D profilometer and SEM. The results show that compared with the Fe60 coating, the secondary dendrite arm spacing of the Fe60-Y2O3 coating is 2.925 μm, which is reduced by 17.4%; the cross-section microhardness is 701 HV 0.3 , which is increased by 9.5%; the friction coefficient is 0.312, which is decreased by 40.3%; and the volume wear rate is 2.36×10 -5 mm 3 / (N · m), which is decreased by 30.8%. Therefore, the Fe60-Y2O3 coating with finer grains has a higher microhardness, lower friction coefficient and better wear

resistance.