Effects of SiC Content on Microstructure and Properties of In-situ Synthesized WC Reinforced Iron-Based Alloy Coating by Laser Cladding

Using the alloy powders with different SiC contents (0-12wt%) as raw material, WC particles reinforced iron-based coatings were in-situ synthesized on 45 steel surface by laser cladding; The effects of SiC content on microstructure, hardness and wear resistance of the coatings were investigated. The results show that, with the increase of mass fraction of SiC in alloy powders, the content and size of WC increased, while the content and size of Fe3W3C increased firstly and then declined. The hardness and wear resistance of the coatings increased firstly and then declined. When the mass fraction of SiC in alloy powders was 8%, the hardness of the coating was 59 HRC, and its relative wear resistance was about 24 times of the substrate.