CHBIHI, Abdelahad; BARBIER, David; GERMAIN, Lionel; HAZOTTE, Alain; GOUNÉ, Mohamed

doi:10.1007/s10853-014-8029-2

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CHBIHI, Abdelahad
Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
ArcelorMittal Maizières Research SA

BARBIER, David
ArcelorMittal Maizières Research SA

GERMAIN, Lionel
Labex DAMAS
Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]

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Article de revue

Ce document a été publié dans

Journal of Materials Science. 2014, vol. 49, n° 10, p. 3608-3621

Springer Verlag

Résumé en anglais

Using both experimental and modeling approaches, we give some clarifications regarding the mechanisms of interaction between ferrite recrystallization and austenite formation in cold-rolled high-strength steels. Using different thermal paths, we show that ferrite recrystallization and austenite formation can be strongly interdependent. The nature of the interaction (weak or strong) affects significantly the austenite formation and the resulting microstructure. We show that the kinetics of austenite formation depends intrinsically on both heating rates and the extent of ferrite recrystallization. An unexpected behavior of austenite growth was also seen at high heating rates. A possible explanation is presented based on the nature of the local equilibrium at the ferrite-austenite interface. The microstructure is more heterogeneous and anisotropic when both austenite formation and ferrite recrystallization overlap. A mechanism of microstructural formation is proposed, and this is supported by 2D simulations' images.< Réduire

Mots clés en anglais

Mechanisms interaction

Modeling approaches

Both experimental

Recrystallization

Ferrite

Cold-rolled high-strength steels

Austenite

DOI

http://dx.doi.org/10.1007/s10853-014-8029-2

Project ANR

Design des Alliages Métalliques pour Allègement des Structures - ANR-11-LABX-0008

Origine

Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026