TY - JOUR

T1 - The Role of Mold Electromagnetic Stirring in the Dissipation of Superheat during the Continuous Casting of Billets

AU - Zhang, Zhao

AU - Wu, Menghuai

AU - Zhang, Haijie

AU - Ludwig, Andreas

AU - Kharicha, Abdellah

N1 - Publisher Copyright: © 2022 The Authors. Steel Research International published by Wiley-VCH GmbH.

PY - 2022/6/29

Y1 - 2022/6/29

N2 - A two-phase solidification model coupling mold electromagnetic stirring (M-EMS) is used to investigate the initial solidification in the mold region of billet continuous casting. One novelty of this numerical study is to quantify how the M-EMS induces primary and secondary flows, interacting with the jet flows coming from the submerged entry nozzle, and how those flows further influence the dissipation of superheat and the initial solidification. The role of the M-EMS in speeding up the superheat dissipation in the mold region, known from previous studies and casting practices, is quantitatively verified. Additionally, some new knowledge regarding the M-EMS is found. The total heat transfer rate from the strand surface to the water-cooled copper mold is not affected by the M-EMS; with the M-EMS, the superheat effect on the solid growth can only be detected in the out-of-the-mold region, while the shell growth inside the mold region is quite independent of the superheat; a strong M-EMS tends to accelerate the growth of the solid shell in the mold region, but delays its growth in the secondary cooling zones. The aforementioned new findings may only be valid for the case of the current billet casting, to be confirmed for other casting formats/parameters.

AB - A two-phase solidification model coupling mold electromagnetic stirring (M-EMS) is used to investigate the initial solidification in the mold region of billet continuous casting. One novelty of this numerical study is to quantify how the M-EMS induces primary and secondary flows, interacting with the jet flows coming from the submerged entry nozzle, and how those flows further influence the dissipation of superheat and the initial solidification. The role of the M-EMS in speeding up the superheat dissipation in the mold region, known from previous studies and casting practices, is quantitatively verified. Additionally, some new knowledge regarding the M-EMS is found. The total heat transfer rate from the strand surface to the water-cooled copper mold is not affected by the M-EMS; with the M-EMS, the superheat effect on the solid growth can only be detected in the out-of-the-mold region, while the shell growth inside the mold region is quite independent of the superheat; a strong M-EMS tends to accelerate the growth of the solid shell in the mold region, but delays its growth in the secondary cooling zones. The aforementioned new findings may only be valid for the case of the current billet casting, to be confirmed for other casting formats/parameters.

KW - continuous casting

KW - electromagnetic stirring

KW - solid shell growth

KW - superheat dissipation

UR - http://www.scopus.com/inward/record.url?scp=85133610118&partnerID=8YFLogxK

U2 - 10.1002/srin.202200065

DO - 10.1002/srin.202200065

M3 - Article

AN - SCOPUS:85133610118

VL - 93.2022

JO - Steel research international

JF - Steel research international

SN - 1611-3683

IS - 10

M1 - 2200065

ER -