Strain heterogeneity and local anisotropy in TWIP steels
- Conference date: 27–29 April 2011
- Location: Belfast, (United Kingdom)
Deformation twinning is known to play a major role in the huge work hardening and formability of TWinning Induced Plasticity steels (TWIP steels). Twins carry a part of the plastic deformation and they act as barriers to dislocation motion. However, their interaction with their parent grain is already anisotropic and they strongly influence the development of texture and macroscopic anisotropy of the material. Twinning in TWIP steels is investigated in this study by means of experimental observations as well as an advanced crystal plasticity model. Individual twins, as they are formed, are treated as separate crystal entities co‐deforming with the parent grain. The behavior of the polycrystalline aggregate is assessed by means of a multisite model of short‐range grain interactions in comparison with the crystal plasticity finite element method (CPFEM) and the Taylor FC model. This approach allows validating the occurrence of twinning in grains with preferred orientations as well as the orientation relation between a twin and its parent grain with evolving deformation. Moreover, the results demonstrate that a combined prediction of macroscopic work hardening, texture and twin volume fraction requires both an appropriate description of strain heterogeneity in the polycrystal and a proper account of the anisotropic twin‐grain interactions at the crystal level.
- Work hardening
- Finite element methods
- Stress strain relations
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