激光功率对42CrMo钢激光熔覆层组织和摩擦磨损性能的影响

利用摩擦磨损试验探究不同激光功率下42CrMo钢激光熔覆层的耐磨性,采用SEM和OM观察了试样摩擦磨损前后的熔覆层组织形貌。结果表明:42CrMo钢基体的摩擦因数较大,且在该摩擦磨损后出现了严重的脆性剥落现象,激光熔覆层可以提升42CrMo钢的耐磨损性能;当激光功率为1600 W时,摩擦因数可降低至0.28,熔覆层表面SEM形貌较为光滑,耐磨性优异,熔覆层组织中的晶粒细化均匀,主要表现为细小的等轴晶,组织较为致密,从而提高了熔覆层的耐磨损性能。

Effect of laser power on microstructure and friction and wear properties of laser clad layer on 42CrMo steel

The wear resistance of the laser clad layer of 42CrMo steel under different laser powers was investigated by using friction and wear test, and the morphologies of the specimens before and after friction and wear were observed by using SEM and OM. The results show that the friction coefficient of 42CrMo steel substrate is larger, and severe brittle peeling is occurred after friction and wear, while the laser clad layer can improve the wear resistance of 42CrMo steel. When the laser power is 1600 W, the friction coefficient can be reduced to 0.28, and the clad layer has relatively smooth SEM surface morphologies with excellent wear resistance. Meanwhile, the clad layer microstructure is dense and mainly composed of uniform fine equiaxed grains caused by grain refinement, thereby improving the wear resistance of the clad layer.