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<p>This work investigates the influence of 2.02 wt.% V addition on the oxidation behaviour of a high-Mn austenitic heat-resistant steel at 1173&#xa0;K in air to understand the effect mechanisms of V on the oxidation damage. The oxidation products and the structures of the oxide scale are systematically examined. The results of oxidation tests indicate that the base steel exhibits parabolic oxidation behaviour, whereas the V-containing steel follows linear oxidation kinetics. The mass gain after oxidised for 100&#xa0;h of the base steel is only 51% of that of the V-containing steel. This demonstrates that the addition of V significantly degrades the oxidation resistance of high-Mn austenitic heat-resistant steel at 1173&#xa0;K. Furthermore, the analysis of the oxide scales and subsurface microstructural evolution of the two steels reveals that the oxidation of the base steel is controlled by the outward diffusion of alloying elements, while that of the V-containing steel is governed by the inward penetration of oxygen. This also explains the catastrophic oxidation observed in the V-containing steel. Finally, the oxidation damage in the base steel is primarily attributed to the combined effects of Cr depletion-induced failure of the protective oxide scale and internal oxidation. In contrast, the oxidation damage in the V-containing steel results from the synergistic action of two factors: (1) the formation of low-melting-point oxides such as V<sub>2</sub>O<sub>5</sub> and CrVO<sub>4</sub>, which act as oxygen carriers and accelerate oxygen ingress into the matrix, and (2) reactions between V<sub>2</sub>O<sub>5</sub> and other oxides that prevent the formation of a continuous protective oxide scale.</p>

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Comparative Analysis of Oxidation Mechanisms in V-Containing and V-Free High-Manganese Austenitic Heat-Resistant Steels at 1173 K

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Yichu Wang,
  • Shanshan Chen,
  • Xiaoyun Deng,
  • Xinyue Zhang,
  • Zhichao Luo,
  • Tianlong Liu

摘要

This work investigates the influence of 2.02 wt.% V addition on the oxidation behaviour of a high-Mn austenitic heat-resistant steel at 1173 K in air to understand the effect mechanisms of V on the oxidation damage. The oxidation products and the structures of the oxide scale are systematically examined. The results of oxidation tests indicate that the base steel exhibits parabolic oxidation behaviour, whereas the V-containing steel follows linear oxidation kinetics. The mass gain after oxidised for 100 h of the base steel is only 51% of that of the V-containing steel. This demonstrates that the addition of V significantly degrades the oxidation resistance of high-Mn austenitic heat-resistant steel at 1173 K. Furthermore, the analysis of the oxide scales and subsurface microstructural evolution of the two steels reveals that the oxidation of the base steel is controlled by the outward diffusion of alloying elements, while that of the V-containing steel is governed by the inward penetration of oxygen. This also explains the catastrophic oxidation observed in the V-containing steel. Finally, the oxidation damage in the base steel is primarily attributed to the combined effects of Cr depletion-induced failure of the protective oxide scale and internal oxidation. In contrast, the oxidation damage in the V-containing steel results from the synergistic action of two factors: (1) the formation of low-melting-point oxides such as V2O5 and CrVO4, which act as oxygen carriers and accelerate oxygen ingress into the matrix, and (2) reactions between V2O5 and other oxides that prevent the formation of a continuous protective oxide scale.