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Effects of vertical electromagnetic stirring on grain refinement and macrosegregation control of bearing steel billet in continuous casting

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Abstract

The grain refinement and macrosegregation control of GCr15 bearing steel were investigated under a type of rarely-used electromagnetic stirring, vertical electromagnetic stirring (V-EMS), in continuous casting. V-EMS can create an upward electromagnetic force and generate longitudinal loop convection, which enables the better mixing of the upper part with the lower part of the liquid steel. The results showed that applying V-EMS can enlarge the region of the equiaxed grain, decrease the secondary dendrite arm spacing (SDAS) and reduce the segregation of both carbon and sulfur. After applying V-EMS, liquid steel with a high solute concentration is brought to the dendrite tips, making the dendrite arms partially melt. The length of the dendrite fragment is approximately 1.8 mm, 10 to 12 times the SDAS. Upon increasing the amount of cooling water from 2.0 to 3.5 m3/h, the dendrite fragments exhibit an obvious aggregation following V-EMS. Finally, a criterion for dendrite fragmentation under V-EMS was derived based on the dendrite fragmentation theory of Campanella et al.

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Authors and Affiliations

  1. Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, 110819, Shenyang, Liaoning, China

    Yu Xu, En-gang Wang Ph.D. (Prof.), Zhuang Li & An-yuan Deng

  2. School of Metallurgy, Northeastern University, 110819, Shenyang, Liaoning, China

    Yu Xu, En-gang Wang Ph.D. (Prof.) & An-yuan Deng

  3. School of Materials Science and Engineering, Northeastern University, 110819, Shenyang, Liaoning, China

    Zhuang Li

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  1. Yu Xu
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  2. En-gang Wang Ph.D.
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  3. Zhuang Li
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  4. An-yuan Deng
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Correspondence to En-gang Wang Ph.D..

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Xu, Y., Wang, Eg., Li, Z. et al. Effects of vertical electromagnetic stirring on grain refinement and macrosegregation control of bearing steel billet in continuous casting. J. Iron Steel Res. Int. 24, 483–489 (2017). https://doi.org/10.1016/S1006-706X(17)30073-0

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  • DOI: https://doi.org/10.1016/S1006-706X(17)30073-0

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