An extended mean field approach for modelling realistic grain size distribution evolutions during Discontinuous Dynamic RX and Post-Dynamic RX

Guillaume Smagghe David Piot 1, 2, 3 Frank Montheillet 3, 2, 4 Aurore Montouchet 5 Marc Bernacki 6 J.J. Jonas 7 Guillaume Kermouche 4, 2, 3
1 RMT-ENSMSE - Département Rhéologie, Microstructure, Thermomécanique
2 SMS-ENSMSE - Centre Science des Matériaux et des Structures
3 LGF-ENSMSE - Laboratoire Georges Friedel
4 PMM-ENSMSE- Département Physique et Mécanique des Matériaux
5 Creusot Forge
6 CEMEF - Centre de Mise en Forme des Matériaux
7 department of metallurgical engineering
Abstract : Mean-field models for Discontinuous DRX (DDRX) have demonstrated for years their ability to reproduce stress and grain size evolutions during hot deformation. However most of them fail to predict grain size distributions, which is necessary to couple DDRX models with Post-Dynamic RX models. Such failure is a consequence of mean field assumptions that prescribe grains to follow the same path in the diameter dislocation-density space. In this paper, an alternative model based on a stochastic approach which permits to deal with the main advantages of mean field models without this limitation is proposed. Results of this new model are successfully compared with experimental data of DDRX and PDRX obtained on a home-made AISI304 deformed up to large strains by hot torsion tests within the range 950 °C – 1150 °C. A comparison with a level-set based full field method of PDRX run on a simplified case is also discussed.
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Communication dans un congrès
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https://hal-mines-paristech.archives-ouvertes.fr/hal-01479167
Contributeur : Magalie Prudon <>
Soumis le : mardi 28 février 2017 - 16:31:51
Dernière modification le : samedi 15 février 2020 - 01:27:16

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  • HAL Id : hal-01479167, version 1

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Guillaume Smagghe, David Piot, Frank Montheillet, Aurore Montouchet, Marc Bernacki, et al.. An extended mean field approach for modelling realistic grain size distribution evolutions during Discontinuous Dynamic RX and Post-Dynamic RX. 6th International Conference on Recrystallization and Grain Growth: Recrystallization II: Dynamic Recrystallization, Jul 2016, Pittsburgh, Pennsylvania, United States. ⟨hal-01479167⟩

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