Abstract
This work investigates the diffusion behavior of Cr and V elements in 50CrVA steel under heating at 950 °C for 30 min, followed by shot peening treatment. The results show that the 50CrVA steel is significantly oxidated. The oxides are mainly Fe₂O₃, Fe₃O₄, and FeCr₂O₄. The Cr element is enriched at the transition layer between the oxides and the matrix. The V element is homogeneously distributed in the oxidation layer and Fe matrix. After the shot peening treatment, the oxides are successfully removed. The oxides containing the V element form during the shot peening treatment. The oxides strengthen surfaces but lead to uneven surfaces. The relatively low heating temperature can effectively decrease the thickness of the oxide layer and reduce V oxides formed in the shot peening process, which is conducive to improving the surface quality.

Key words
50CrVA steel, oxidation, surface quality

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