Effect of CeO₂ Adding Content on the Microstructure and Tribological Properties of Iron-Based Alloy Coatings

Abstract

For improving the wear properties of 12Cr1MoV steel surface， the mixture of iron alloy powder and CeO2 powder was used as raw material， and the laser cladding technology was used to prepare CeO2-containing iron-based alloy coating on the surface of 12Cr1MoV steel.The effect of CeO2 mass fraction (0～1.5%) in the raw material on the metallographic structure， phase composition， microhardness， friction and wear performance and impact abrasive wear performance of the coating was studied systematically.Results showed that the addition of CeO2 could reduce defects and refine the grains of the coating.When the mass fraction of CeO2 was 1.0%， the coating was dense， the refinement effect was the most obvious， and the coating structure was the best.Furthermore， the addition of CeO2 had a significant effect on the phase composition of the coating， and the coating containing CeO2 was composed of Fe(Cr) solid solution， CeNi3 and Cr23C6.With the increase of CeO2 content，the coating hardness first increased and then decreased，and the friction coefficient，friction and wear mass loss and impact abrasive wear mass loss first decreased and then increased.When the mass fraction of CeO2 was 1.0%，the microhardness of the coating was the highest， which was 23.6%higher than that of the coating without CeO2.In general， the average friction coefficient， friction and wear mass loss and impact abrasive wear mass loss of the coating prepared with 1.0%CeO2 were significantly lower than those of the substrate and other coatings.

Keywords

• laser cladding|ceo2|iron-based alloy coating|structure|phase composition|hardness|friction and wear|impact abrasive wear