Abstract: The 15kW continuous wave CO2laser has been used for cladding WC reinforced Ni base alloy to steel CCS B.The effect of WC weight percent on microstructure and microhardness of laser cladding layers was studied. The results show that in the process of laser cladding the mixture of WC particles and Ni based alloy powder, WC particles dissolve and react with surrounding elements to form low melting point eutectics, which exist in the shape of branch, block and grain. With the increasing of WC content, γ Ni dendrites in the upper zone of cladding layers first coarsen then refine, which coarsen steadily in the lower zone of cladding layers. At the same time, the average hardness of cladding layers increases, which is about three times that of the matrix when weight percent of WC is 0 %, while it can be four times that of the matrix when weight percent of WC is 30 %.
Key words: laser cladding; Ni base alloy; WC particle; microstructure; hardness
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