Abstract
A CoCrMoW alloy with little carbon was manufactured through laser beam powder bed fusion technique. Nanoscale intermetallic Co3(Mo,W)2Si precipitates uniformly dispersed on the γ-Co phase matrix, and caused less segregation of Cr and Mo elements than the microscale carbides in the wrought CoCrMo alloy. Nanoindentation test results showed that the nano hardness of Co3(Mo,W)2Si precipitate was 16.4 GPa, about 1.6 times of that of the matrix. The Volta potential of nanoscale Co3(Mo,W)2Si precipitate was 14 mV more positive than the matrix. The corrosion resistance of the PBF-LB alloy in 0.9% NaCl solution was larger than that of the wrought alloy.
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