Study on Pores and Crack Sensitivity of Ni- based Composite Coating by Laser Cladding

This study aims to explore the types and mechanism of pores and crack on Ni-based composite coating of laser cladding. The results show that pores are generally found on the surface and bottom of cladding layer, and the gas comes from the cladding or the interaction between composites during the cladding process. There are two major categories of cracks, vertical crack and horizontal ones, which is mainly related to the low melting eutectic in the cladding area, and also relevant to coating composition, contents of inclusion and laser specific energy.