Laser melting treatment was performed on the high velocity oxy-fuel sprayed cemented carbide coatings with a 5 kW continuous wave CO： Laser. The microstructure was analyzed by Olympus GX51 microscope, and the microhardness from surface to inside was measured by HXY-1000TAY micro-hardness meter. The results show that laser melting treatment can refine the microstructure of spraying coatings, and the hard phase of the laser melted layer distributes dispersedly. The microhardness of the laser melted layer is much higher than the substrate and distributes homo...
