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<p>The oxidation behavior of AISI 5140 low-alloy steel was investigated under air at oxidation temperatures ranging from 800 to 1100&#xa0;°C and oxidation times ranging from 5 to 120&#xa0;min. The microstructure and chemical composition of the oxide layer were characterized, and an oxidation kinetic model was constructed. The oxide layer exhibited a multi-layered structure, with the outer layer consisting primarily of Fe<sub>2</sub>O<sub>3</sub>, the intermediate layer of Fe<sub>3</sub>O<sub>4</sub>, and the inner layer comprising FeO and pre-eutectic Fe<sub>3</sub>O<sub>4</sub>. At the scale-substrate interface, a Si and Cr enriched layer was present. This study employed vertical rolling to descale the surface of oxidized samples; the effect of secondary oxidation on descaling performance was investigated. The results indicated that after the specimens were oxidized at 1200&#xa0;°C in air, they were subjected to descaling and rolling processes, with a large amount of residual oxides remaining on their surfaces and poor flatness. When the specimens were oxidized at 1200&#xa0;°C in air and descaled, followed by secondary oxidation at 1000&#xa0;°C in air, and then subjected to descaling and rolling processes, their surfaces exhibited reduced residual oxides and improved flatness.</p>

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Investigation of the Effect of Secondary Oxidation on the Descaling Performance of AISI 5140 Low-Alloy Steel

  • 期刊论文

  • 发表日期：

    2025年9月7日

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  • Haoran Jiang,
  • Xiaojiang Liu,
  • Tao Jia,
  • Haoyu Zhang,
  • Zhang Wei,
  • Yangqiang He,
  • Borui Zhang,
  • Limeng Cao

摘要

The oxidation behavior of AISI 5140 low-alloy steel was investigated under air at oxidation temperatures ranging from 800 to 1100 °C and oxidation times ranging from 5 to 120 min. The microstructure and chemical composition of the oxide layer were characterized, and an oxidation kinetic model was constructed. The oxide layer exhibited a multi-layered structure, with the outer layer consisting primarily of Fe2O3, the intermediate layer of Fe3O4, and the inner layer comprising FeO and pre-eutectic Fe3O4. At the scale-substrate interface, a Si and Cr enriched layer was present. This study employed vertical rolling to descale the surface of oxidized samples; the effect of secondary oxidation on descaling performance was investigated. The results indicated that after the specimens were oxidized at 1200 °C in air, they were subjected to descaling and rolling processes, with a large amount of residual oxides remaining on their surfaces and poor flatness. When the specimens were oxidized at 1200 °C in air and descaled, followed by secondary oxidation at 1000 °C in air, and then subjected to descaling and rolling processes, their surfaces exhibited reduced residual oxides and improved flatness.