Effects of WC-Co reinforced Ni-based alloy by laser melting deposition: Wear resistance and corrosion resistance*

Abstract

WC-Co reinforced C276 alloy composite coatings are fabricated on Q235 steel by laser melting deposition. The microstructure, hardness, wear performance, and electrochemical corrosion behavior of composite coating are studied. The results show that WC-Co particles are mostly uniformly distributed in the coating and provide favorable conditions for heterogeneous nucleation. The microstructure of C276/WC-Co composite coatings is composed of γ-Ni solid solution dendrites and MoNi solid solution eutectics. The WC-Co particles can effectively improve the hardness and wear resistance of C276 alloy. The average hardness of the composite coating containing 10-wt% WC-Co (447 HV0.2) are 1.26 times higher than that of the C276 alloy (356 HV0.2). The wear rate of composite coating containing 10-wt% WC-Co (6.95 × 10−3 mg/m) is just 3.5% of that of C276 coating (196.23 × 10−3 mg/m). However, comparing with Hastelloy C276, the corrosion resistance of C276/WC-Co composite coating decreases.