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<p>Electromagnetic stirring (EMS) is recognized as one of the most effective technologies for mitigating macrosegregation and improving the quality of the solidification structure in continuously cast round blooms. In recent years, steel plants have widely adopted S-EMS technology in addition to the conventional M+F-EMS configuration to further improve the internal quality of round blooms. However, the specific effects of S-EMS on the continuous casting process of round bloom remain unclear, and the synergistic mechanisms among M-EMS, S-EMS, and F-EMS in multi-stage electromagnetic stirring systems have not been systematically investigated. Based on our previously developed three-phase solidification model for continuously cast round bloom, this study comprehensively investigates the effects of multi-stage EMS (M+S+F-EMS) processes on electromagnetic field distribution, solidification structure evolution, and macrosegregation in round bloom of 42CrMoS4 steel with a diameter of Φ650&#xa0;mm. The results indicate that M-EMS has a notable impact on expediting the dissipation of superheat, enhancing the grain nucleation, and enlarging the equiaxed region. Compared with the case without M-EMS, the application of M-EMS results in a 6.0 pct increase in equiaxed crystal zone area. S-EMS improves solidification asymmetry between inner and external arc regions but has a limited effect on equiaxed zone expansion. F-EMS shows negligible impact on the solidification structure morphology of round bloom. When applying M-EMS, a subsurface negative segregation zone forms at 0.025m below the round bloom surface. S-EMS effectively reduces local positive segregation in the CET transition zone while improving solute distribution between inner and external arcs. Most notably, F-EMS plays a pivotal role in mitigating center positive segregation, reducing the segregation ratio from 1.17 to 1.06 compared to non-F-EMS conditions. In addition, the multi-stage electromagnetic stirring system (M+S+F-EMS) effectively integrates the advantages of various EMS configurations, namely: M-EMS enlarges the center equiaxed zone, S-EMS reduces local positive segregation in the CET transition zone, and F-EMS improves the center segregation. Consequently, the application of multi-stage EMS (M+S+F-EMS) can effectively improve the uniform solidification structure and solute distribution in the round bloom.</p>

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Effect of Multi-stage Electromagnetic Stirring on Solidification Structure and Macrosegregation in Continuously Cast Round Bloom

  • 期刊论文

  • 发表日期：

    2025年7月30日

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  • Yuwei Yang,
  • Sen Luo,
  • Lie Chen,
  • Haida Wang,
  • Weiling Wang,
  • Miaoyong Zhu

摘要

Electromagnetic stirring (EMS) is recognized as one of the most effective technologies for mitigating macrosegregation and improving the quality of the solidification structure in continuously cast round blooms. In recent years, steel plants have widely adopted S-EMS technology in addition to the conventional M+F-EMS configuration to further improve the internal quality of round blooms. However, the specific effects of S-EMS on the continuous casting process of round bloom remain unclear, and the synergistic mechanisms among M-EMS, S-EMS, and F-EMS in multi-stage electromagnetic stirring systems have not been systematically investigated. Based on our previously developed three-phase solidification model for continuously cast round bloom, this study comprehensively investigates the effects of multi-stage EMS (M+S+F-EMS) processes on electromagnetic field distribution, solidification structure evolution, and macrosegregation in round bloom of 42CrMoS4 steel with a diameter of Φ650 mm. The results indicate that M-EMS has a notable impact on expediting the dissipation of superheat, enhancing the grain nucleation, and enlarging the equiaxed region. Compared with the case without M-EMS, the application of M-EMS results in a 6.0 pct increase in equiaxed crystal zone area. S-EMS improves solidification asymmetry between inner and external arc regions but has a limited effect on equiaxed zone expansion. F-EMS shows negligible impact on the solidification structure morphology of round bloom. When applying M-EMS, a subsurface negative segregation zone forms at 0.025m below the round bloom surface. S-EMS effectively reduces local positive segregation in the CET transition zone while improving solute distribution between inner and external arcs. Most notably, F-EMS plays a pivotal role in mitigating center positive segregation, reducing the segregation ratio from 1.17 to 1.06 compared to non-F-EMS conditions. In addition, the multi-stage electromagnetic stirring system (M+S+F-EMS) effectively integrates the advantages of various EMS configurations, namely: M-EMS enlarges the center equiaxed zone, S-EMS reduces local positive segregation in the CET transition zone, and F-EMS improves the center segregation. Consequently, the application of multi-stage EMS (M+S+F-EMS) can effectively improve the uniform solidification structure and solute distribution in the round bloom.