Microstructure and property of laser cladding TiC reinforced composition coating

Based on the optimum component design，wear resistant Ti-matrix functional gradient materials composite coating was fabricated on substrate of a titanium alloy TC4 by laser cladding process using TC4, Cr2C3 and Ti powder blends in order to enhance the tribological properties of TC4. Microstructure of the coating was characterized and the coating microhardness was tested. And its wear resistance was evaluated under room-temperature dry-sliding wear test conditions. The results show that the composite coating has fine microstructure consisting of in-situ TiC particles uniformly distributed in the matrix in the form of big dendrite and graininess structure along cladding direction and is metallurgically bonded to the titanium substrate. The coatings exhibit excellent wear resistance due to the rapidly solidified fine microstructure and the presence of a large amount of in-situ TiC.