Surface Modification of 1Cr17Ni2 Stainless Steel

The reinforced coating of GH4169 powder was prepared on the surface of 1Cr17Ni2 stainless steel by laser cladding process to study the impact of laser power and scanning speed on the mechanical properties of the cladding, and to analyzing the microstructure and hardness of the cladding section prepared under the best process parameters. The results show that, The section of the cladding layer is divided into the cladding zone, the bonding zone and the matrix heat affected zone, in which the cladding zone is composed of dendritic (γ+Laves) eutectic structure, and the structure in the bonding zone is coarse columnar structure, and there is a vertical fusion line, which is growing towards the cladding layer, while the structure in the matrix heat affected zone is composed of coarse needle-like martensite. With the increase of laser power and scanning speed, the hardness of the cladding zone increases showing a tendency of increasing first and then decreasing. In the cladding section prepared under the optimum process parameters, the hardness of the cladding zone is in the range of 317~326 HV, which is higher than that of 1Cr17Ni2 stainless steel.