Metallurgical and Materials Transactions A

, Volume 49, Issue 11, pp 5509–5523 | Cite as

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

  • Min Hyeok Kwon
  • Jin-Kyung KimEmail author
  • Jian Bian
  • Hardy Mohrbacher
  • Taejin Song
  • Sung Kyu Kim
  • Bruno C. De Cooman


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.



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


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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  • Min Hyeok Kwon
    • 1
  • Jin-Kyung Kim
    • 1
    • 5
    Email author
  • Jian Bian
    • 2
  • Hardy Mohrbacher
    • 3
  • Taejin Song
    • 4
  • Sung Kyu Kim
    • 4
  • Bruno C. De Cooman
    • 1
    • 6
  1. 1.Graduate Institute of Ferrous TechnologyPohang University of Science and TechnologyPohangSouth Korea
  2. 2.CBMM Asia PTE LtdSingaporeSingapore
  3. 3.NiobelCon bvbaSchildeBelgium
  4. 4.Steel Products Research Group, Technical Research LaboratoriesPOSCOGwangyangSouth Korea
  5. 5.Department of Energy ScienceSungkyunkwan University (SKKU)SuwonKorea
  6. 6.NLMK GroupMoscowRussia

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