In situ synthesis of TiC-VC particles reinforced Fe-based metal matrix composite coating by laser cladding

Using a 5 kW CO₂ laser, in situ synthesized TiCVC particles reinforced Fe-based alloy composite coating was prepared by preplaced ferrotitanium, ferrovanadium and graphite etc. The microstructure and properties of the composite coatings were investigated by optical microscope, X-ray diffractometer, electron probe microanalyzer and microhardness tester.Results indicated that TiC-VC particles are produced by direct metallurgical reaction among ferrotitanium, ferrovanadium and graphite during laser cladding process. It was also found that fine TiC-VC particles are dispersed in the matrix.The microhardness of the coatings, which was enhanced by the TiC-VC particles, was much greater than that of the Q235 substrate.