Microstructure and properties of Fe based amorphous coatings deposited by laser cladding under different preheating temperatures

Abstract

An Fe-based amorphous coating on the surface of H13 steel was prepared by preheating the base materials followed by laser cladding. The microstructure and properties of cladding layer under various preheating temperatures were studied. The results show that various preheating temperatures substantially affect the molding quality. When the preheating temperature was 250 °C, cracks on the cladding layer disappeared; only a small amount of pore defects was present; and the comprehensive properties of cladding layer was the best at that time. With further increase in preheating temperature, cracks appeared in the cladding layer again; preheating temperature remarkably affected the elemental distribution inside the cladding layer. The higher the preheating temperature, the more evenly the elements were distributed. In addition, while the amorphous phase has higher corrosion resistance, the corrosion resistance of the crystalline phase dispersed in the amorphous phase can also be improved.