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<p>Mold electromagnetic stirring has been extensively implemented in continuous casting to ameliorate billet quality through enhancing molten steel flow dynamics. However, as current intensity escalates, subsurface negative segregation within the billet becomes progressively exacerbated. To address this issue, a modulated electromagnetic stirring (MM-EMS) strategy is introduced, which periodically adjusts input current intensity. A three-dimensional multiphase solidification model coupled with electromagnetic field was developed, incorporating a proportional function to dynamically adjust electromagnetic force magnitude. The transient behaviors of fluid flow, heat transfer, solidification, and inclusion motion were systematically analyzed under different stirring configurations. Model validation was performed via comparative analysis with Tesla meter measurements of magnetic flux density distributions. Numerical results demonstrate that the optimized MM-EMS with a 300&#xa0;A peak current intensity maintains comparable performance to regular 300&#xa0;A stirring in terms of superheat reduction, solidified shell homogeneity improvement, and inclusion removal efficiency. Significantly, the periodic current of MM-EMS increases the surface velocity of the molten steel, promotes the dissolution of the slag, and exhibits excellent effects in mitigating subsurface negative segregation.</p>

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Effect of Modulated Electromagnetic Stirring in Continuous Casting Bloom

  • 期刊论文

  • 发表日期：

    2025年10月30日

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  • Zhixuan Dong,
  • Cheng Ji,
  • Miaoyong Zhu,
  • Liangyong Chen

摘要

Mold electromagnetic stirring has been extensively implemented in continuous casting to ameliorate billet quality through enhancing molten steel flow dynamics. However, as current intensity escalates, subsurface negative segregation within the billet becomes progressively exacerbated. To address this issue, a modulated electromagnetic stirring (MM-EMS) strategy is introduced, which periodically adjusts input current intensity. A three-dimensional multiphase solidification model coupled with electromagnetic field was developed, incorporating a proportional function to dynamically adjust electromagnetic force magnitude. The transient behaviors of fluid flow, heat transfer, solidification, and inclusion motion were systematically analyzed under different stirring configurations. Model validation was performed via comparative analysis with Tesla meter measurements of magnetic flux density distributions. Numerical results demonstrate that the optimized MM-EMS with a 300 A peak current intensity maintains comparable performance to regular 300 A stirring in terms of superheat reduction, solidified shell homogeneity improvement, and inclusion removal efficiency. Significantly, the periodic current of MM-EMS increases the surface velocity of the molten steel, promotes the dissolution of the slag, and exhibits excellent effects in mitigating subsurface negative segregation.