In order to study the microstructure and mechanical properties of multilayer Fe-based wear-resistant layer, we establish the finite element numerical model of temperature field of Fe-based stainless steel wear-resistant layer laser-melted on the surface of 42CrMo substrate under different power of heat source, compare the optimal melting process parameters, and carry out the experiments of multilayer laser melting, and observe the surface roughness, microstructure, and micro-hardness of melted area. The results show that the surface quality of the cladding layer is gradually improved with the increase of the number of layers, and the width of the white bright zone in the bonding area and the grain size show a tendency of increasing and then decreasing. The hardness of the top of the cladding layer decreases with the increase of the number of layers, and the average hardness of the bonding zone decreases and then increases with the increase of the number of layers. The hardness of the top of the double-layer cladding is 646 HV, and the hardness value of the bonding zone is 439 HV, which is close to that of the substrate.
Xiao et al. (Sat,) studied this question.