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A new criterion for internal crack formation in continuously cast steels

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Abstract

To estimate the cracking condition in continuously cast steels, a new model for critical fracture stress given from the measured critical strain has been proposed, which can take into account the brittle temperature range and strain rate. The effects of brittle temperature range and strain rate on critical strain for internal crack formation were analyzed. When the brittle temperature range and strain rate were increased, the possibility of internal crack formation increased due to the decreasing critical strain. To describe the thermomechanical property model of the mushy zone between zero strength temperature (ZST) and zero ductility temperature (ZDT), the yield criterion for porous metals, which can take into account δ/γ transformation, was used. Using the fitting equation for the measured critical strain and the microsegregation analysis, the thermomechanical behavior of the mushy zone could be successfully described by the proposed model, which incorporates the effects of microsegregation of solute elements and δ/γ transformation on hot tear during solidification at the given range of steel compositions and strain rates. A cracking criterion based on the difference of deformation energy in the brittle temperature range is proposed to explain the cracking phenomenon of whole carbon range.

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Author notes

  1. Young Mok Won Ph.D. (Postdoctoral Student)

    Present address: the School of Materials Science and Engineering and Research Institute of Advanced Materials, Seoul National University, 151-742, Seoul, Korea

Authors and Affiliations

  1. University of Illinois at Urbana-Champaign, 61801, Urbana, IL

    Young Mok Won Ph.D. (Postdoctoral Student)

  2. the School of Materials Science and Engineering and Research Institute of Advanced Materials, Seoul National University, 151-742, Seoul, Korea

    Tae-Jung Yeo (Postdoctor), Dong Jin Seol (Postdoctoral Student) & Kyu Hwan Oh (Professor)

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  1. Young Mok Won Ph.D.
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  2. Tae-Jung Yeo
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  3. Dong Jin Seol
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  4. Kyu Hwan Oh
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Won, Y.M., Yeo, TJ., Seol, D.J. et al. A new criterion for internal crack formation in continuously cast steels. Metall Mater Trans B 31, 779–794 (2000). https://doi.org/10.1007/s11663-000-0115-y

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