Evolution behavior regulation of carbide in Fe-based laser cladding coating

The carbide 'compound introduction method' was presented and used to regulate the evolution behavior of carbide in Fe-based laser cladding coating. The results shows that, compared with in-situ processing, this method has great advantage and potential in regulating the evolution behavior of carbide. It can promote the formation of granular carbide and inhibits the formation of eutectic NbC, and then realize the regulation of carbide morphology. Moreover, this method can effectively control the size of carbide. In the whole cladding coating, the size of granular carbide is more uniform and not more than 2 mu m. And these granular carbide can also be distributed in the coating more uniformly. In the meanwhile, this method can increase the content of carbide in coating. However, it decreases the microhardness of laser cladding coating.