Microstructure and Properties of Insitu Synthesized TiC/Graphene/Ti6Al4V Composite Coating by Laser Cladding

A graphene (Gr)/Ti6Al4V composite coating was prepared by laser cladding, and the microstructure and the properties were studied. The results showed that an in situ synthesis between Gr and Ti occurred and TiC was formed. The TiC was homogeneously distributed. The α’ acicular martensite was formed at the bottom of the coating during the rapid solidification process, and a good metallurgical bond was formed between the coating and substrate. The TiC and the self-lubrication of Gr improved the wear resistance of coating. And the wear mechanism changed from more serious abrasive and adhesive wear to a mild wear with fine scratches. Meanwhile, severe oxidative wear occurred in the coating and substrate under high-temperature friction and wear. The corrosion resistance of the coating was also improved. The corrosion morphology changed from denudation and pitting to local pitting. The Gr and TiC in the coating effectively preventeds the corrosion.