Abstract: Using a 5kW CO₂ laser, in situ synthesis of TiC-VC particles reinforced Fe-based alloy composite coatings were put forth by using ferrotitanium, ferrovanadium and graphite. The microstructure and properties of the composite coatings were investigated by optical microscopy, X-ray diffractometer (XRD), electron probe microanalyzer (EPMA) and a skimming wear machine. Results indicate that TiC-VC particles can be produced by direct metallurgical reaction between ferrotitanium, ferrovanadium and graphite during the laser cladding process. It was also found that fine TiC-VC particles disperse in the matrix. The wear-resisting property of the higher TiC-VC particles coating is larger than the lower ones in certain areas.

Key words: in situ synthesis, TiC-VC particles , laser cladding