Modelling the effect of microstructure evolution on the macroscopic behavior of single phase and dual phase steels: Application to sheet forming process

Salima Bouvier (1) , Tales Carvalho-Resende (2) , Tudor Balan (2) , Farid Abed-Meraim (2)

1 Roberval - Roberval
2 LEM3 - Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux

The aim of this work is to develop a dislocation density based model for IF and DP steels that incorporates details of the microstructure evolution at the grain-size scale. The model takes into account (i) the contribution of the chemical composition for the prediction of the initial yield stress, (ii) the description of initial texture anisotropy by incorporating grain-size dependent anisotropy coefficients in Hill’48 yield criterion, (iii) the contribution of three dislocation density “families” that are associated with forward, reverse and latent structures. It reproduces the macroscopic transient behaviors observed when strain-path changes occur. The model is implemented in FE code in order to assess its predictive capabilities in case of industrial applications.

Mots clés: Micromechanical modeling; Microstructural evolution; Sheet metal forming; IF and DP steels; dislocation density

Domaines: Génie des procédés; Matériaux; Mécanique [physics.med-ph]; Génie mécanique [physics.class-ph]; Matériaux et structures en mécanique [physics.class-ph]; Mécanique des matériaux [physics.class-ph]; Mécanique des solides [physics.class-ph]; Mécanique des structures [physics.class-ph]; Micro et nanotechnologies/Microélectronique

Salima Bouvier, Tales Carvalho-Resende, Tudor Balan, Farid Abed-Meraim. Modelling the effect of microstructure evolution on the macroscopic behavior of single phase and dual phase steels: Application to sheet forming process. International Symposium on Plasticity and its Current Applications: Plasticity’15, Jan 2015, Montego Bay, Jamaica. ⟨hal-01936486⟩