Study on Microstructure and Properties of TiC Reinforced Stellite F Alloy Laser Cladding Layer

Abstract

TiC Reinforced Stellite F alloy cladding layer was prepared on the surface of 304 stainless steel by laser cladding technology to improve the wear resistance and hardness of stainlesssteel surface. The cladding layer was analyzed by X-ray diffraction, metallographic examination, hardness examination, wear test and scanning electron microscope. The results show that the Stellite $\mathbf{F}$ laser cladding layer is mainly composed of $\gamma \mathrm{Co},\mathrm{Cr}_{2}\mathrm{Ni}_{3}$ and $\mathrm{Ni}_{1}7\mathrm{~W}_{3}$ phases. After TiC is added, the cladding layer were formed with $\mathrm{Cr}_{3}\mathrm{C}_{2},\mathrm{Co}_{3}\mathrm{Ti}$ and TiC phases. The microstructure of Stellite F laser cladding layer is composed of plane crystal, dendriTiC crystal and equiaxed crystal. After TiC is added, massive phases with different sizes and shapes appeared in the cladding layer, which were mainly composed of TiC and newly formed intermetallic compounds of titanium. When the addition amount of TiC is less than 10%, the hardness of laser cladding layer does not increase but decreases, and the wear resistance at room temperature becomes worse. When the addition amount of TiC reaches 20%, the hardness and room temperature wear resistance of the cladding layer are significantly improved, the hardness reaches 876HV, and the room temperature wear resistance is more than 15 times that of 304 stainlesssteel.