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<p>To quantitatively analyze the effect of steel composition (including total aluminum, total calcium, total magnesium, total oxygen, and total sulfur) on the growth behavior of MnS and the solutes redistribution during the solidification process in continuous casting of resulfurized steel, a coupled mathematical model was established. Comprehensive impacts of phase transformation, dendritic coarsening, elements interactions, as well as the precipitation and growth of MnS inclusions on solute microsegregation were taken into account. The Gibbs free energy for MnS precipitation, solute concentration, microsegregation degree of solutes, the accumulated amount and size of MnS inclusions were quantitatively calculated. The results suggested that in the molten steel, aluminum, magnesium, and sulfur mainly existed in a dissolved condition. In contrast, calcium and oxygen mostly appeared as inclusions. Firstly, during the cooling and solidification of the molten steel, inclusions acted as sites for the heterogeneous nucleation of MnS. Further, the interaction between solute elements had an impact on the precipitation and growth of MnS. The MnS morphology was determined by the cumulative effect of these two issues.</p>

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Coupled Mathematical Modeling of the Solute Microsegregation, Precipitation and Growth of MnS Inclusions During Solidification in the Continuous Casting Process of a Resulfurized Steel

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Sha Ji,
  • Yue Li,
  • Ziming Wang,
  • Qiang Yue,
  • Kaijun Niu

摘要

To quantitatively analyze the effect of steel composition (including total aluminum, total calcium, total magnesium, total oxygen, and total sulfur) on the growth behavior of MnS and the solutes redistribution during the solidification process in continuous casting of resulfurized steel, a coupled mathematical model was established. Comprehensive impacts of phase transformation, dendritic coarsening, elements interactions, as well as the precipitation and growth of MnS inclusions on solute microsegregation were taken into account. The Gibbs free energy for MnS precipitation, solute concentration, microsegregation degree of solutes, the accumulated amount and size of MnS inclusions were quantitatively calculated. The results suggested that in the molten steel, aluminum, magnesium, and sulfur mainly existed in a dissolved condition. In contrast, calcium and oxygen mostly appeared as inclusions. Firstly, during the cooling and solidification of the molten steel, inclusions acted as sites for the heterogeneous nucleation of MnS. Further, the interaction between solute elements had an impact on the precipitation and growth of MnS. The MnS morphology was determined by the cumulative effect of these two issues.