Mechanical Behavior of Multi-Phase Steels Comprising Retained Austenite

Emin Semih Perdahcıoğlu*, Hubert J.M. Geijselaers

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)
74 Downloads (Pure)


The retained austenite (RA) in advanced high-strength steel (AHSS) grades, such as dual-phase (DP) steels, plays an important role on their formability. Thanks to the transformation-induced plasticity (TRIP) effect that occurs during the mechanically induced transformation of RA into martensite, additional ductility is obtained. Martensite has a higher flow stress than austenite; hence, the transformation results in an apparent hardening, which is beneficial for the stability of deformation. The stability of RA at a given temperature strongly depends on its carbon content, which, in AHSS, is not uniform but distributed. The aim of this study is to build a model that predicts the transformation as well as TRIP in a DP steel grade with RA. A physics-based kinetic model is presented that captures the transformation of retained austenite based on the thermodynamic driving force of the applied stress. A direct analytical estimate of transformation plasticity is provided, which is consistent with the kinetic model. Transformation kinetics is incorporated in a self-consistent, mean-field homogenization-based constitutive model. Finally, an indication of the effect of transformation of retained austenite on formability is given.

Original languageEnglish
Article number498
Issue number2
Publication statusPublished - 10 Jan 2022


  • AHSS
  • DP steel
  • Formability
  • Homogenization
  • Martensitic phase transformation
  • Self-consistent
  • Transformation plasticity
  • UT-Gold-D


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