Abstract
Deformation twinning, a common and important plastic deformation mechanism, is the key contributor to the excellent combination of strength and ductility in twinning-induced plasticity (TWIP) steel. In the open literature, a significant amount of research has been reported on the microstructural characteristics of deformation twinning and its influence on the overall deformation behavior of TWIP steel. In this study, we examine the feasibility of a mechanism-based crystal plasticity model in simulating the microstructural level deformation characteristics of TWIP steel. To this end, a model considering both double-slip and double-twin is developed to investigate the stress-strain behavior and local microstructural features related to the formation and growth of micro-twins in low stacking fault energy (SFE) TWIP steel. The twin systems are described as pseudo-slips that can be activated when their resolved shear stress reaches the corresponding critical value. A hardening law that accounts for the interaction among the slip and twin systems is also developed. Numerical simulations for different mesh sizes and single crystal patch tests under different loading modes are carried out to verify the modeling procedure. Our simulation results reveal that, despite its simple nature, the double-slip/double-twin model can capture the key deformation features of TWIP steel, including twin volume fraction evolution, continuous strain hardening, and the final fracture in the form of strain localization.
| Original language | English |
|---|---|
| Pages (from-to) | 206-218 |
| Number of pages | 13 |
| Journal | Materials Science and Engineering: A |
| Volume | 607 |
| DOIs | |
| State | Published - Jun 23 2014 |
| Externally published | Yes |
Funding
Pacific Northwest National Laboratory is operated by the Battelle for the U.S. Department of Energy (DOE) under Contract no. DE-AC05-76RL01830 . This work was funded by DOE׳s Vehicle Technologies Office under the Automotive Lightweighting Materials Program managed by Mr. William Joost, the National Science Foundation of China (Grant no. 51231002 ) and the Fundamental Research Funds for the Central Universities (Grant no. 06111020 ). Y.Y. Wang would like to acknowledge scholarship support from the China Scholarship Council . H.M. Zbib acknowledges that his contribution to this publication was made possible by a National Priorities Research Program grant (No. NPRP 05-1294-2-559 ) from the Qatar National Research Fund (a member of the Qatar Foundation). The statements made herein are the sole responsibility of the authors.
| Funders | Funder number |
|---|---|
| U.S. Department of Energy | DE-AC05-76RL01830 |
| Qatar Foundation | |
| Qatar National Research Fund | |
| Vehicle Technologies Office | |
| National Natural Science Foundation of China | 51231002 |
| China Scholarship Council | NPRP 05-1294-2-559 |
| Fundamental Research Funds for the Central Universities | 06111020 |
Keywords
- Crystal plasticity model
- Deformation twinning
- Finite element model
- Pseudo-slip
- Shear bands
- Strain localization