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<p>This study examined how adding Al affects the surface oxide scale and internal oxidation behavior of AHSS in hot-rolled coil processes. Experimental results showed that Al-containing alloys exhibited a significantly shallower internal oxidation depth. Additionally, the transformation of the surface oxide layer into reduced metallic iron occurred at a slower rate. These effects are linked to Al’s ability to promote the formation of Mn<sub>2</sub>SiO<sub>4</sub> and MnAl<sub>2</sub>O<sub>4</sub> oxides at the interfacial regions, which act as barriers to oxygen diffusion. Moreover, Al addition encouraged the development of intricate core–shell structured oxides, accelerating the depletion of solute elements within the grain interiors.</p>

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Effect of Al on Surface Oxide Scale and Internal Oxidation in Hot-Rolled Coil of Fe–Mn–Si-Based Alloys

  • 期刊论文

  • 发表日期：

    2025年6月2日

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  • Wentao Zhang,
  • Shiheng Liu,
  • Weichen Mao,
  • Jufeng Hong,
  • Xinyan Jin,
  • Guangxin Wu

摘要

This study examined how adding Al affects the surface oxide scale and internal oxidation behavior of AHSS in hot-rolled coil processes. Experimental results showed that Al-containing alloys exhibited a significantly shallower internal oxidation depth. Additionally, the transformation of the surface oxide layer into reduced metallic iron occurred at a slower rate. These effects are linked to Al’s ability to promote the formation of Mn2SiO4 and MnAl2O4 oxides at the interfacial regions, which act as barriers to oxygen diffusion. Moreover, Al addition encouraged the development of intricate core–shell structured oxides, accelerating the depletion of solute elements within the grain interiors.