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Solidification Microsegregation and Hot Ductility of Fe-Mn-C-Al-xNb TWIP Steels

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Abstract

The influence of Nb addition on casting microstructures and high-temperature mechanical properties of Fe-Mn-C-Al-xNb TWIP steels was analyzed by phase-field modeling and experiments. Phase-field simulations showed that Mn, Nb, and C are enriched in inter-dendritic regions while Al is enriched in dendritic regions during solidification process of the investigated TWIP steels. Both phase-field simulations and microstructural characterization show that NbC precipitates are preferentially present near inter-dendritic boundaries. Nb addition slightly reduces hot ductility of the investigated steel at 1173 K (900 °C) while the Nb-added TWIP steels show better hot-ductility than the reference steel for deformation temperatures above 1373 K (1100 °C). NbC precipitates and inter-dendritic distances appear to be the most important variables that affect hot-ductility behavior of the investigated TWIP steels.

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Acknowledgments

The authors gratefully acknowledge the support of CBMM and the POSCO Technical Research Laboratories.

Author information

Author notes

  1. Jin-Kyung Kim

    Present address: Department of Energy Science, Sungkyunkwan University (SKKU), Suwon, 16419, Korea

  2. Bruno C. De Cooman

    Present address: NLMK Group, Moscow, Russia, 119017

Authors and Affiliations

  1. Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang, 37673, South Korea

    Min Hyeok Kwon, Jin-Kyung Kim & Bruno C. De Cooman

  2. CBMM Asia PTE Ltd, Singapore, 049315, Singapore

    Jian Bian

  3. NiobelCon bvba, 2970, Schilde, Belgium

    Hardy Mohrbacher

  4. Steel Products Research Group, Technical Research Laboratories, POSCO, Gwangyang, 57807, South Korea

    Taejin Song & Sung Kyu Kim

Authors
  1. Min Hyeok Kwon
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  2. Jin-Kyung Kim
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  4. Hardy Mohrbacher
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Correspondence to Jin-Kyung Kim.

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Manuscript submitted March 8, 2018.

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Kwon, M.H., Kim, JK., Bian, J. et al. Solidification Microsegregation and Hot Ductility of Fe-Mn-C-Al-xNb TWIP Steels. Metall Mater Trans A 49, 5509–5523 (2018). https://doi.org/10.1007/s11661-018-4893-8

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  • DOI: https://doi.org/10.1007/s11661-018-4893-8

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