Microstructure, Microhardness, and Wear Resistance of Laser Cladding Cr-Ni Alloy and Stellite6 Layers on 27SiMn Steel

Using the laser cladding technique, utilizing the hydraulic support column material as the substrate. It comprehensively analyzed the microstructure and mechanical properties of Cr-Ni alloy laser cladding (LC) layer and Stellite6 LC layer using techniques such as x-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), microhardness testing and wear resistance testing. The findings indicate that the primary composition of the Stellite6 LC layer comprises γ-Co and carbides M₂₃C₆ and M₇C₃, while the Cr-Ni alloy LC layer forms a singular austenitic phase. Both materials exhibit similar grain patterns characterized by dendrites and equiaxed grains within the LC layer. The average microhardness of the Stellite6 LC layer measures 536 HV_0.5, surpassing that of Cr-Ni alloy specimen by 1.29 times and 27SiMn steel by 2.61 times. Wear surface analysis indicates that the wear mechanism of Cr-Ni alloy samples includes abrasive wear, slight adhesive wear and oxidative wear. The wear surface of the Stellite6 LC layer is relatively smooth, with abrasive wear as the primary mechanism.