Microstructure and wear resistance of(Ti,Nb) C reinforced composite coating in-situ synthesized by argon arc cladding

Ni-based reinforced composite coating was prepared on the surface of 16Mn steel by means of argon arc cladding technique with the prealloyed powders of Ni60A,Nb,Ti and C.The microstructure of the composite coating was examined with OM,SEM and XRD,and the abrasion property of the coating was measured under different loads.The results showed that metallurgical bonding between the coating and the substrate occurred without defects like pores and cracks.The microstructure of the composite coating consisted of(Ti,Nb) C particles,γ-Ni austenite dendrites and Cr₂₃C₆ eutectics.With the increase of load at room temperature,the weight loss during abrasion of the composite coating increased slowly,whereas that of 16Mn steel increased remarkably.The wear resistance of the composite coating was 11 times higher than that of the substrate.