|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced High-strength Steels
||Crystal-plasticity Modeling of the Dislocation-dominated Strain Hardening in a TWIP Steel
||Yizhuang Li, Mingxin Huang
|On-Site Speaker (Planned)
A dislocation-based crystal plasticity model taking into account deformation twinning was developed to investigate the deformation behavior of a TWIP steel. The model integrated the thermally activated nature of dislocation motions into the phenomenological power-law relation between stress and strain rate, and thus avoiding any adjustment of fitting parameters such as strain-rate sensitivity and reference strain rate. Model predictions for the overall stress-strain responses and dislocation density evolutions under various temperature conditions matched well with experimental results. Specifically, the present model captured the stress and strain fields, texture evolution, slip and twin activities during the deformations. In addition, the contributions of twins to the total plastic strain and the strain hardening were computed, confirming the dominance of the dislocation-driven plasticity for the present TWIP steel with dense and tangled dislocations. These findings suggested that carbon atoms and the associated hardening mechanisms may account for the excellent strain-hardening properties.
||Planned: Supplemental Proceedings volume