Calculation of Initial Stage of Solidified Shell Deformation during δ to γ Transformation in Mold

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  • Furumai Kohei
    Steelmaking Research Department, Steel Research Laboratory, JFE Steel Corporation
  • Zurob Hatem
    Department of Materials Science and Engineering, McMaster University
  • Phillion Andre
    Department of Materials Science and Engineering, McMaster University

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Other Title
  • 鋳型内δ/γ変態時の凝固初期シェル変形計算
  • イガタ ナイd/gヘンタイジ ノ ギョウコ ショキ シェル ヘンケイ ケイサン

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Abstract

<p>Solidification shell deformations within the mold during continuous casting have been calculated in order to clarify the influence of mold flux infiltration variability on the cooling rate, the width of the low heat flux region, the height of air gap, the unevenness of solidified shell, and the resulting strain in the solidified shell. A sequentially coupled thermal-mechanical finite element model has been developed to perform the calculations. The simulation includes heat transfer and shell deformation in a growing solidified shell, along with the delta-to-gamma transformation. Further, it takes into account the effects of variability in mold flux infiltration and air gap formation on heat transfer into the mold, as well as the effect of cooling rate on the thermal expansion resulting from delta-to-gamma transformation. The results showed that mild cooling and small width of low heat flux region (i.e. low variability in mold flux infiltration) strongly decrease the height of the air gap, the unevenness in the solidified shell and the strain in the solidified shell. It is confirmed that it is important to optimize the cooling rate and prevent the variation in mold flux infiltration, especially at near the meniscus region of δ to γ transformation in order to minimize longitudinal crack formation.</p>

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 107 (2), 112-120, 2021

    The Iron and Steel Institute of Japan

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