Effect of Laser-Clad NiCrAl-SiC Coatings on Friction-Wear Performance of AISI H13 Steel at High Temperature

NiCrAl-SiC coatings were prepared on AISI H13 steel by laser cladding (LC) to enhance the friction-wear performance of hot work mold. The microstructure and phases of obtained coatings were analyzed using an ultra-depth microscope (UDM) and x-ray diffraction (XRD), respectively. The influences of SiC mass fraction on the coefficient of frictions (COFs) and wear rates of NiCrAl-SiC coatings were investigated using a wear tester. The results show that the NiCrAl-SiC coatings have excellent high temperature wear resistance, and the COFs and wear rates decrease with the increase in SiC mass fraction. The wear mechanism is the combination of abrasive wear, adhesive wear and oxidative wear. The addition of SiC particles increases the coating hardness and reduces the effect of adhesive wear, which improves the anti-wear performance of NiCrAl coating.