A Microstructural Finite Element Analysis of TWIP Steel Based on Dislocation Density Model

N. Torabian, S. Ziaei-Rad, M. Jafari and G. Dini 

Metallography, Microstructure, and Analysis, Volume 5, Issue 2, February 2016, Pages 85–94

ABSTRACT

In this paper, a dislocation density-based finite element model is developed to study the behavior of twinning-induced plasticity (TWIP) steels in which mechanical twinning plays a significant role in the plastic deformation process. The model is calibrated for Fe-31Mn-3Al-3Si TWIP steel using experimental data. Comparison of the computational results with experimental observations suggests that the numerical model acceptably predicts the macroscopic behavior and the twinning content of the material. Next, the developed numerical model is employed to investigate some microstructural characteristics of the material. The effect of grain size on twinning is also studied. In addition, different loading conditions on a representative volume element are considered to reveal the existence of any relationship between twinning and triaxiality.

Keywords: