The influence of the austenitic microstructural morphology on the mechanical response of a multiphase steel is analyzed by comparing two relevant configurations, namely (i) uniformly distributed grains of retained austenite embedded in a ferritic matrix and (ii) a banded morphology of the two phases. The analysis is carried out numerically using a discrete dislocation-transformation model that captures processes occurring at sub-grain length scales connected to nucleation and evolution of individual dislocations and martensitic platelets inside the austenitic grains. The simulations indicate that a microstructure composed of uniformly distributed grains of austenite is optimal in terms of strength since it delays the onset of plastic localization compared with banded microstructures.
|Tijdschrift||Modelling and Simulation in Materials Science and Engineering|
|Nummer van het tijdschrift||7|
|Status||Published - okt-2011|
|Evenement||5th International Conference on Multiscale Materials Modeling - , Germany|
Duur: 4-okt-2010 → 8-okt-2010