Abstract

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In this article, the advantages of laser cladding were briefly introduced, and a method for improving the life of piercing plug was provided by the laser cladding experiment. In situ formation of TiC particles reinforced Ni-base composite coating was prepared on the surface of piercing plug material H13 steel by CO₂ laser. The microstructure of the clad layer was characterized by SEM, EDX and XRD. The microhardness and wear resistance of the laser clad layer was examined. The results show that laser clad layer can be achieved under technical processing parameters and that the good metallurgical bonding is formed between the coating and substrate. The coating is uniform, continuous and free of pores and cracks. The microstructure of the clad layer contains the TiC reinforced phase. The microhardness of the clad layer is 800-950HV0.2, about 2.5-3 times larger than that of the substrate. The clad layer is reinforced by particles and grain-refining, resulting in greatly increase in life comparing with piercing plug material H13 steel.

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