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<p>In order to save equipment investment, the commercial continuous caster is widely used to produce diverse round bloom with a compatible final electromagnetic stirring (F-EMS) device, and thus, the eccentric final electromagnetic stirring is commonly observed during the continuous casting process. In this study, based on our previously proposed three-phase solidification model for continuous casting process, the effect of eccentric F-EMS on the magnetic field, solidification structure, and macrosegregation are fully investigated in the 42CrMoS4 steel continuously cast round bloom with diameter of 350, 450, 550, and 650&#xa0;mm, respectively. The eccentric degrees of geometric, electromagnetic force, velocity, and solute concentration are introduced to clarify the effect of eccentric F-EMS on electromagnetic force, stirring velocity, and macrosegregation. The results indicate the eccentric round bloom solidification structure is mainly caused by the grain sedimentation during the solidification process, which is benefit for the equiaxed grains accumulation at the front of columnar grains and leads the columnar to equiaxed transition (CET) later the inner arc side than on the external arc side of round bloom. But the eccentric solidification structure of round bloom is almost not affected by the eccentric F-EMS, because the location of F-EMS is at 15.0&#xa0;m from the meniscus, and the CET has occurred in the round bloom before the application of F-EMS. Moreover, the eccentric F-EMS has an influence on the electromagnetic field, stirring velocity, and solute concentration in the round bloom. Both the electromagnetic force and stirring velocity on the inner arc side are lower than those on the external arc side with eccentric F-EMS. The negative segregation difference near the center of the round bloom becomes more pronounced, and the center positive segregation also increases as the geometric eccentricity increases. When the geometric eccentric degrees are 15.4, 30.8, and 46.2&#xa0;pct, the eccentric degrees of electromagnetic force are, respectively, 44.7, 54.1, and 64.1&#xa0;pct, the eccentric degrees of maximum tangential velocity are, respectively, 20.0, 33.3, and 50.0&#xa0;pct, the eccentric degrees of negative segregation induced by the F-MES are, respectively, 1.1, 2.1, and 3.1&#xa0;pct, and the center segregation ratios are, respectively, 1.08, 1.09, and 1.10.</p>

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Effect of Eccentric Final Electromagnetic Stirring on Solidification Structure and Macrosegregation in Continuously Cast Round Bloom

  • 期刊论文

  • 发表日期：

    2025年4月14日

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

摘要

In order to save equipment investment, the commercial continuous caster is widely used to produce diverse round bloom with a compatible final electromagnetic stirring (F-EMS) device, and thus, the eccentric final electromagnetic stirring is commonly observed during the continuous casting process. In this study, based on our previously proposed three-phase solidification model for continuous casting process, the effect of eccentric F-EMS on the magnetic field, solidification structure, and macrosegregation are fully investigated in the 42CrMoS4 steel continuously cast round bloom with diameter of 350, 450, 550, and 650 mm, respectively. The eccentric degrees of geometric, electromagnetic force, velocity, and solute concentration are introduced to clarify the effect of eccentric F-EMS on electromagnetic force, stirring velocity, and macrosegregation. The results indicate the eccentric round bloom solidification structure is mainly caused by the grain sedimentation during the solidification process, which is benefit for the equiaxed grains accumulation at the front of columnar grains and leads the columnar to equiaxed transition (CET) later the inner arc side than on the external arc side of round bloom. But the eccentric solidification structure of round bloom is almost not affected by the eccentric F-EMS, because the location of F-EMS is at 15.0 m from the meniscus, and the CET has occurred in the round bloom before the application of F-EMS. Moreover, the eccentric F-EMS has an influence on the electromagnetic field, stirring velocity, and solute concentration in the round bloom. Both the electromagnetic force and stirring velocity on the inner arc side are lower than those on the external arc side with eccentric F-EMS. The negative segregation difference near the center of the round bloom becomes more pronounced, and the center positive segregation also increases as the geometric eccentricity increases. When the geometric eccentric degrees are 15.4, 30.8, and 46.2 pct, the eccentric degrees of electromagnetic force are, respectively, 44.7, 54.1, and 64.1 pct, the eccentric degrees of maximum tangential velocity are, respectively, 20.0, 33.3, and 50.0 pct, the eccentric degrees of negative segregation induced by the F-MES are, respectively, 1.1, 2.1, and 3.1 pct, and the center segregation ratios are, respectively, 1.08, 1.09, and 1.10.