About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
Presentation Title |
Deformation Behaviour of High-alloy Twinning-induced Plasticity Steels Unravelled by Complementary Local and Integral Methods |
Author(s) |
Stefan Martin, Christiane Ullrich, Christian Schimpf, Mykhaylo Motylenko, Anja Weidner, Horst Biermann, David Rafaja, Alexey Vinogradov, Yuri Estrin |
On-Site Speaker (Planned) |
Stefan Martin |
Abstract Scope |
A model is presented that accounts for the underlying deformation mechanisms involving slip/twin interaction and offers a constitutive description in terms of the rate of nucleation of deformation twins and their influence on dislocation storage to describe the excel-lent mechanical properties. The framework for the constitutive model is provided by the Kocks-Mecking-Estrin approach. The key parameter, the stacking fault probability, as well as dislocation density, spacing of deformation bands/twins and texture are used. The mod-el was trialled on X2CrMnNi16-7-10 TWIP steel. A range of local and global materials characterization methods (XRD, TEM, ECCI, EBSD combined with acoustic emission data) were employed. This offered insights in temporal variation of the contributions of different deformation mechanisms. It was shown that direct contribution of deformation twinning to overall plastic strain was insignificant and the main effect was of indirect nature, through influence on dislocation glide, and the ensuing effect on the strain hardening. |
Proceedings Inclusion? |
Planned: |