Influence of Y Nano-Oxide and Its Secondary Phase on Microstructure, Mechanical Properties, and Wear Behavior of the Stainless Steel Coatings Fabricated by Plasma Transfer Arc

Rare-earth is an efficient refiner for surface modification of steel material. This study presents the synergistic influence Y2O3 nanoparticles (YNPs) and Mn-oxide secondary phase on microstructure mechanical properties 14CrSiMnV coating fabricated by plasma transfer arc cladding process. The results indicated that residual Y accumulated with Mn, forming a oxide particle instead inclusions or slags during rapid cooling solidification coating. Due to enlarged equiaxed grains, declining long-range dendritic strengthening, coatings present hybrid-type fracture mechanism, less plastic deformation, third-body interaction. With optimal addition YNPs (0.4 wt.%), are improved, as increase 92.0% in tensile strength, 55.6% elongation, 11.3% microhardness, decrease 22.2% wear weight loss, 28.3% relative resistance.