Abstract:
Ni-coated SiC
p reinforced Ni35 alloy laser-cladding layer was prepared on surface of H13 die steel substrate by laser cladding technique. The microstructure and the friction and wear performance at 25, 600℃ of the cladding layer were studied. The results show that the cladding layer was composed of
γ-Ni(Fe)+M
3(B, Si) eutectic phase, M
23C
6 carbide, M
7C
3 carbide, Ni
31Si
12 nickel-silicide, and graphite. After friction and wear at different temperatures, the cladding layer had a higher surface microhardness and a lower wear volume than the substrate. The wear resistance at 25℃ of the cladding layer was improved greatly comparing with that of the substrate, and the improvement effect was higher than that at 600℃. The wear mechanism at 25℃ of the cladding layer was mainly micro-abrasive wear and adhesive wear, while that at 600℃ was abrasive wear, adhesive wear and slight oxidation wear.