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<p>Electromagnetic stirring (EMS) serves as a critical technology in round bloom continuous casting, effectively mitigating macrosegregation through contactless electromagnetic forces that enhance molten steel flow. While conventional rotary EMS (R-EMS) has been widely adopted, multi-stage EMS configurations have been developed to further improve casting homogeneity. More recently, traveling-wave linear EMS (L-EMS) has demonstrated potential in refining the solidification structure and promoting compositional uniformity. Nevertheless, the synergistic behavior of hybrid multi-mode EMS systems—particularly those integrating R-EMS and L-EMS during solidification remains inadequately understood. In this paper, a three-phase model is employed to examine the influence of a novel axial traveling-wave electromagnetic stirring (AL-EMS) combined with conventional R-EMS on the solidification behavior of an Φ 800 mm 42CrMoA round bloom. The results show that AL-EMS, when applied in the secondary cooling zone, markedly reduces solidification asymmetry, decreasing the difference in columnar crystal length between the inner and external arcs by 29.4 pct compared to rotary S-EMS. Mechanistic analysis indicates that rotary S-EMS mitigates local positive segregation by transporting solute-enriched equiaxed crystals toward the liquid core, thereby promoting solute dispersion. In contrast, linear traveling-wave S-EMS generates an upward flow that accumulates equiaxed crystals near the solidification front, aggravating solute entrapment. Rotary F-EMS resulted in center segregation with maximum and minimum segregation ratios of 1.06 and 0.94, respectively. In comparison, linear traveling-wave F-EMS produced no negative segregation and achieved a more uniform center segregation ratio of 1.02. Furthermore, reversing the stirring direction of the traveling-wave linear S-EMS was observed to effectively diminish the maximum carbon concentration difference across the round bloom section.</p>

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Macrosegregation and Solidification Structure in Continuously Cast Round Bloom with Multi-stage and Multi-mode Electromagnetic Stirring: A Numerical Study

  • 期刊论文

  • 发表日期：

    2026年1月9日

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  • Yuwei Yang,
  • Sen Luo,
  • Weiling Wang,
  • Miaoyong Zhu

摘要

Electromagnetic stirring (EMS) serves as a critical technology in round bloom continuous casting, effectively mitigating macrosegregation through contactless electromagnetic forces that enhance molten steel flow. While conventional rotary EMS (R-EMS) has been widely adopted, multi-stage EMS configurations have been developed to further improve casting homogeneity. More recently, traveling-wave linear EMS (L-EMS) has demonstrated potential in refining the solidification structure and promoting compositional uniformity. Nevertheless, the synergistic behavior of hybrid multi-mode EMS systems—particularly those integrating R-EMS and L-EMS during solidification remains inadequately understood. In this paper, a three-phase model is employed to examine the influence of a novel axial traveling-wave electromagnetic stirring (AL-EMS) combined with conventional R-EMS on the solidification behavior of an Φ 800 mm 42CrMoA round bloom. The results show that AL-EMS, when applied in the secondary cooling zone, markedly reduces solidification asymmetry, decreasing the difference in columnar crystal length between the inner and external arcs by 29.4 pct compared to rotary S-EMS. Mechanistic analysis indicates that rotary S-EMS mitigates local positive segregation by transporting solute-enriched equiaxed crystals toward the liquid core, thereby promoting solute dispersion. In contrast, linear traveling-wave S-EMS generates an upward flow that accumulates equiaxed crystals near the solidification front, aggravating solute entrapment. Rotary F-EMS resulted in center segregation with maximum and minimum segregation ratios of 1.06 and 0.94, respectively. In comparison, linear traveling-wave F-EMS produced no negative segregation and achieved a more uniform center segregation ratio of 1.02. Furthermore, reversing the stirring direction of the traveling-wave linear S-EMS was observed to effectively diminish the maximum carbon concentration difference across the round bloom section.