On deformation twinning in a 17.5% Mn-TWIP steel: A physically based phenomenological model

A. Soulami, K. S. Choi, Y. F. Shen, W. N. Liu, X. Sun, M. A. Khaleel

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

TWinning Induced Plasticity (TWIP) steel is a typical representative of the 2nd generation advanced high strength steels (AHSS) which exhibits a combination of high strength and excellent ductility due to the deformation twinning mechanisms. This paper discusses the principal features of deformation twinning in faced-centered cubic austenitic steels and shows how a physically based macroscopic model can be derived from microscopic-level considerations. In fact, a dislocation-based phenomenological model, with internal state variables including dislocation density and micro-twins volume fraction describing the microstructure evolution during deformation process, is proposed to model the deformation behavior of TWIP steels. The originality of this work lies in the incorporation of a physically based model on twin nucleation and volume fraction evolution in a conventional dislocation-based approach. Microstructural level experimental observations with scanning electron microscope (SEM) and transmission electron microscope (TEM) techniques together with the macroscopic quasi-static tensile test, for the TWIP steel Fe-17.5. wt.% Mn-1.4. wt.% Al-0.56. wt.% C, are used to validate and verify the modeling assumptions. The model could be regarded as a semi-phenomenological approach with sufficient links between microstructure and the overall mechanical properties, and therefore offers good predictive capabilities. Its simplicity also allows a modular implementation in finite element-based metal forming simulations.

Original languageEnglish
Pages (from-to)1402-1408
Number of pages7
JournalMaterials Science and Engineering A
Volume528
Issue number3
DOIs
Publication statusPublished - 25 Jan 2011

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Keywords

  • Deformation mechanisms
  • Dislocation
  • Microstructure
  • Microtwins
  • Stacking fault energy
  • TWIP steel

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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