Effect of In-situ Formed NbC on Microstructure and Wear Resistance of Fe60/TiC Composite Coating by Laser Cladding

Fe60-based composite coatings with different TiC and Nb contents were prepared on the surface of Q235 steel by laser cladding technology, and NbC strengthened phases were formed by in-situ reaction to investigate the effects of the addition of Nb on the microstructure evolution and mechanical properties of the cladding layers. The results show that the in-situ synthesized phase consists of strengthening phases such as TiC, Nb2C and NbC. After adding Nb, Nb reacts with TiC to form NbC, which improves the particle distribution uniformity of the coating. Compared with that of the Fe60 coating, the microhardness of the coatings with Nb addition decreases, but the wear rate is reduced through improving the microstructure.