Abstract
By means of optical microscope, SEM and EDS, the microstructure of laser cladding layer under 1200W laser heat input was analyzed. Through the research, the relationship between precipitate characteristics and properties of the cladding layer was studied, and failure reason was found. The results show that Co, Cr and W elements have the tendency of short-range diffusion in the surface region in Stellite 6 alloy with a jagged shape. In this area, Co-Cr-W-Fe precipitated and hardened layer formed with high hardness and abrasive resistance but a lower ductility. Meanwhile, intergranular phase M23C6 precipitated. Some parts the big temperature gradient and overheat accelerated the precipitation process, led to the incomplete fusion of dendritic crystal, crack initiation and propagation on account of the integrated factors. Some solutions were put forward to reduce the failure risk.
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