Cr17Ni14Mo3 Powder Laser Cladding on 45Steel Substrate

Abstract

The relationship between laser power, scan-rate, thickness of pre-placed powder particles, overlap, preheating and laser cladding coating quality was analyzed. Laser cladding of Cr17Ni14Mo3 stainless steel powders on 45steel substrate was conducted, and microstructure of laser cladding coating was analyzed. The micro-hardness and wear testing of laser cladding layer were examined. The results showed that microstructure of laser cladding zone was exiguous dentrite, and there were dispersion of hard spots in the laser cladding zone. Performances of erode-resistant, surface hardness and wear-resistant were improve obviously. The residual stress in cladding coating usually was tensile stress, with the further increasing depth of coating, the residual stress began to fall and stabilized gradually, and the residual stress values in substrate was smaller than in cladding coating.