Microstructure and wear resistance of laser clad TiC particle reinforced coating

A TiC–Ni alloy composite coating was clad to 1045 steel substrate using a 2 kW CO2 laser. The microstructural constituents of the clad layer arefound to be γ-Ni and TiCp in the dendrites, and afine eutectic of γ-Ni plus (Fe,Cr)23C6 in the interdendritic areas. Partial dissolution and aggregation of the original TiC particles during melting of the Ni alloy and their growth during resolidification on cooling are observed. The TiC particles offer significantly enhanced wear resistance, the degree of wear depending primarily on the debonding removal of the particles. MST/3018