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Metals and Materials International

, Volume 23, Issue 3, pp 459–464 | Cite as

On the rule-of-mixtures of the hardening parameters in TWIP-cored three-layer steel sheet

  • Jung Gi Kim
  • Seung Mi Baek
  • Won Tae Cho
  • Tae Jin Song
  • Kwang-Geun Chin
  • Sunghak Lee
  • Hyoung Seop Kim
Article

Abstract

Although twinning-induced plasticity (TWIP) steels have high tensile strength with high strain hardening and large uniform elongation due to the formation of deformation twins during plastic deformation, sheet formabilities of TWIP steels are relatively poor. In this study, to overcome this problem, TWIP-cored three-layer architectured steel sheets are produced using cladding with low carbon steel sheaths. For an optimum design of layer architectured materials, strain hardening exponent n and strain rate sensitivity m of the layer sheets are theoretically and experimentally investigated. The forced-based rule-of-mixtures well reproduces the experimental values of the equivalent n and m. Contrary to the conventional rule-of-mixtures, the equivalent n and m of the TWIP-cored mild steel-sheath layered sheets are governed not only by volume fractions and n and m of parent materials but also by the strength of strong layer.

Keywords

TWIP steel composite tensile test rule-of-mixtures mechanical properties 

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Copyright information

© The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht 2017

Authors and Affiliations

  • Jung Gi Kim
    • 1
  • Seung Mi Baek
    • 1
  • Won Tae Cho
    • 2
  • Tae Jin Song
    • 2
  • Kwang-Geun Chin
    • 2
  • Sunghak Lee
    • 1
  • Hyoung Seop Kim
    • 1
    • 3
  1. 1.Department of Materials Science and EngineeringPohang University of Science and Technology (POSTECH)PohangRepublic of Korea
  2. 2.HIMASS Research Project Team, Technical Research LaboratoriesPOSCOGwangyangRepublic of Korea
  3. 3.Center for High Entropy AlloysPohang University of Science and Technology (POSTECH)PohangRepublic of Korea

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