Metals and Materials International

, Volume 16, Issue 1, pp 1–6 | Cite as

On the transitions of deformation modes of fully austenitic steels at room temperature

  • Kyung-Tae Park
  • Gyosung Kim
  • Sung Kyu Kim
  • Sang Woo Lee
  • Si Woo Hwang
  • Chong Soo Lee
Article

Abstract

The present study was undertaken to provide a more comprehensive understanding of the deformation modes of advanced fully austenitic steels exhibiting an enhanced combination of strength and ductility. For this purpose, a new plasticity, called microband induced plasticity (MBIP), was introduced. In addition, the origin of its superb combination of strength and ductility over the well-known transformation induced plasticity (TRIP) and twin induced plasticity (TWIP) was elucidated. With the aids of previously developed models, we focused on predicting the transitions among TRIP, TWIP, and MBIP, primarily in terms of the stacking fault energy. The analysis revealed that the TRIP-TWIP transition can be reasonably predicted by the energy balance for FCC austenite — HCP ɛ martensite transformation. The TWIP-MBIP transition can be addressed by the critical stress for mechanical twinning, which causes the infinite divergence of the Shockley partials. Lastly, the TWIP-MBIP transition model was validated by comparing it with the experimental data.

Keywords

metals deformation mechanical properties tensile test dislocation twining 

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Copyright information

© The Korean Institute of Metals and Materials and Springer Netherlands 2010

Authors and Affiliations

  • Kyung-Tae Park
    • 1
  • Gyosung Kim
    • 2
  • Sung Kyu Kim
    • 2
  • Sang Woo Lee
    • 3
  • Si Woo Hwang
    • 4
  • Chong Soo Lee
    • 5
  1. 1.Division of Advanced Mater. Sic. & Engr.Hanbat National UniversityDaejonKorea
  2. 2.TWIP Steel Research Project TeamPOSCO Technical Research Lab.GwangyangKorea
  3. 3.Mater. & Systems Engr.Kumoh National Institute of TechnologyGyeongbukKorea
  4. 4.Steel Research InstituteYonsei UniversitySeoulKorea
  5. 5.Department of Mater. Sci. & Engr.POSTECHGyeongbukKorea

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