Abstract
The NiCrBSi MMC coatings were formed on the surface steel using laser processing to reinforce the wear resistance of steel substrate. The NiCrBSi MMC layer were composed of the coating zone (CZ) and the bonding zone (BZ). The microstructures and properties of the coatings were investigated. The results showed that the NiCrBSi MMC coatings with no micro-cracks, lamella structures, pores and voids mainly consisted of reticulation structure of Fe-Cr solid solution and blocky structure of Fe-Ni solid solution, which were as solid solution strengthening in CZ. A small quantity of Ni3Si phases and carbide dispersed in interdendritic structure. Compared with the steel substrate, the wear properties of the NiCrBSi coatings significantly improved due to the high hardness chrome dendritic phase and contain hard particles. Consequently, the weight loss after wear test for the NiCrBSi coatings is much less than that of steel substrae.
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