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Melt flow, heat transfer and solidification in a flexible thin slab continuous casting mold with vertical-combined electromagnetic braking

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Abstract

During continuous casting of steel slabs, the application of electromagnetic braking technology (EMBr) provides an effective tool to influence solidification by controlling the pattern of melt flow in the mold. Thus, the quality of the final product can be improved considerably. A new electromagnetic braking (EMBr) method, named vertical-combined electromagnetic braking (VC-EMBr), is proposed to be applied to a flexible thin slab casting (FTSC) mold. To evaluate the beneficial effects of the VC-EMBr, the melt flow, heat transfer, and solidification processes in the FTSC mold are studied by means of numerical simulations. In detail, a Reynolds-averaged Navier–Stokes turbulence model together with an enthalpy-porosity approach was used. The numerical findings are compared with respective simulations using the traditional Ruler-EMBr. The results demonstrate that the application of the VC-EMBr contributes significantly to preventing relative slab defects. In contrast to the Ruler-EMBr, the additional vertical magnetic poles of the VC-EMBr preferentially suppress the direct impact of jet flow on the narrow face of FSTC mold and considerably diminish the level fluctuation near the meniscus region. For instance, by applying a magnetic flux density of 0.3 T, the maximum amplitude of meniscus deflection reduces by about 80%. Moreover, the braking effect of the VC-EMBr effectively improves the homogeneity of temperature distribution in the upper recirculation region and increases the solidified shell thickness along the casting direction. On this basis, the newly proposed VC-EMBr shows a beneficial effect in preventing relative slab defects for FTSC thin slab continuous casting.

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Acknowledgements

The authors are grateful to the National Natural Science Foundation of China (Grant Nos. U1760206 and 51574083) and the 111 Project (2.0) of China (No. BP0719037) for the financial support. The first author is grateful for financial support provided by the Institute of Thermodynamics and Fluid Mechanics at Technische Universität Ilmenau, Germany, and the Verein zur Förderung der Thermo-und Fluiddynamik e.V. Furthermore, the authors are grateful to Deutsche Forschungsgemeinschaft (DFG) for the financial support in the framework of the Research Training Group Lorentz Force Velocimetry and Lorentz Force Eddy Current Testing (GRK 1567). Finally, the authors acknowledge support by the Computer Center at TU Ilmenau for providing the computational resources.

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Authors and Affiliations

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

    Lin Xu, Ze-feng Han & En-gang Wang

  2. Key Laboratory of Liaoning Province for Clean Combustion Power Generation and Heating Technology, Shenyang Institute of Engineering, Shenyang, 110136, Liaoning, China

    Lin Xu

  3. Institute of Thermodynamics and Fluid Mechanics, Technische Universität Ilmenau, Ilmenau, 98684, Germany

    Christian Karcher

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  1. Lin Xu
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  2. Ze-feng Han
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  4. En-gang Wang
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Correspondence to En-gang Wang.

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Xu, L., Han, Zf., Karcher, C. et al. Melt flow, heat transfer and solidification in a flexible thin slab continuous casting mold with vertical-combined electromagnetic braking. J. Iron Steel Res. Int. 31, 401–415 (2024). https://doi.org/10.1007/s42243-023-01062-9

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  • DOI: https://doi.org/10.1007/s42243-023-01062-9

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