Microstructure, wear and corrosion resistance of laser-cladding Fe-based coatings on agricultural machinery tools

Abstract

In order to improve the wear and corrosion resistance of 60Si2Mn steel, two kinds of Fe-based alloy powders, X1 and X2, were deposited on the surface by laser cladding technology, and the microstructure, wear and corrosion resistance of the coatings were investigated. Results show that both coatings were mainly composed of α-Fe, with the structure of outer fine equiaxed dendrites and inner coarser mixed columnar dendrite and cellular grains. The average hardness, wear and corrosion resistance of the substrate were effectively improved after coating. Compared with the X2 coating, X1 coating showed a higher hardness of 860 HV and a better wear resistance, which was attributed to the existence of a higher content of carbide. However, due to the high Cr content and the higher reduction potential of Ni, X2 coating showed better corrosion resistance.