Oxidation mechanism of TiC reinforced CrMnFeCoNi composite coatings by laser cladding at 600 degrees C/750 degrees C/900 degrees C

摘要

The TiC-reinforced CrMnFeCoNi composite coating were produced by laser cladding (LC), and the oxidation process of composite coating at 600 degrees C/750 degrees C/900 degrees C was investigated and the oxidation mechanism was analyzed. The oxidation results of the composite coatings at 600 degrees C and 750 degrees C shown that Mn2O3, Cr2O3, and TiO2 were the main oxides. At 900 degrees C, a large amount of Fe from the substrate diffused into the coating due to the enhanced heat-induced atomic diffusion, which changed the oxidation properties of the coating itself, and Fe3O4 appeared in the oxide layer.