Abstract
In order to meet the surface modification and repair requirements of 8407 hot extrusion die, Y2O3 powder and WC powder were added as strengthening phases into an H13 powder. The coatings were strengthened through laser-cladding and then applied on the surface of 8407 steel. XRD, SEM, EDS, and Vickers high-temperature hardness tests were used to analyze the properties of the laser-cladding coating, such as its phase composition, microstructure, high-temperature hardness, and high-temperature stability. The M7C3 composite strengthening phase was evenly distributed throughout the entire coating in a three-dimensional reticular shape, resulting in a uniform hardness distribution. The addition of Y2O3 accelerated the decomposition of WC particles, which increased the uniformity of the laser-cladding coating. The hardness of the laser-cladding coating at room temperature was 818.7 HV, which was 48.4% higher than that of the substrate, and its hardness at 500 °C was 555.6 HV, which was 32.3% higher than that of the substrate. The hardness values of the laser-cladding coatings at different holding times were roughly the same as 8407 steel. After holding for a certain time at different high temperatures, the hardness of the laser-cladding coatings was double that of 8407 steel.
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