Analysis of banded morphology in multiphase steels based on a discrete dislocation-transformation model

Jingyi Shi*, Sergio Turteltaub, Erik Van der Giessen

*Corresponding author for this work

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Abstract

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.

Original languageEnglish
Article number074006
Pages (from-to)074006-1-074006-13
Number of pages13
JournalModelling and Simulation in Materials Science and Engineering
Volume19
Issue number7
DOIs
Publication statusPublished - Oct-2011
Event5th International Conference on Multiscale Materials Modeling - , Germany
Duration: 4-Oct-20108-Oct-2010

Keywords

  • INDUCED PLASTICITY
  • RETAINED AUSTENITE
  • MICROSTRUCTURE
  • STABILITY

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