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Communication Dans Un Congrès Année : 2022

An approach to get around the problem of properly describing nucleation in mean field modelling of recrystallization

Résumé

Mean field models in metallurgy aim to describe implicitly polycrystalline microstructures. The model developed by our team in CEMEF is a mean field model that also considers the history of the microstructure and topological aspects by using a specific neighborhood for each grain class. Such a model gives satisfying distribution correlation with experimental values when simulating Grain Growth or Discontinuous Dynamic Recrystallization on austenitic stainless steel in the range of strain rates from 0.001 s−1 to 1 s−1. However, above this range, the microstructure prediction may differ due to the reduction of the deformation time and the Post Dynamic Recrystallization appearing before the quenching. The mean field model may need to be modified to account for these characteristics. Experimentally, the recrystallized (RX) fraction depending on the strain rate adopts an inflexion point around 0.1 s−1 or 1 s−1 suggesting a change of the predominant mechanism. Indeed, from the work of A. Nicolaÿ et al., EBSD analyses reveal that the total RX fraction varies from a 100% dynamically recrystallized microstructure at low strain rate to a fully post-dynamically recrystallized microstructure around 1 s−1 for the Inconel 718 alloy. To better understand the nucleation, a complete experimental campaign is here carried out at strain rates from 0.01 s−1 to 500 s−1 . The effect of the temperature, the deformation and strain rate on the recrystallized grain size distribution are studied on the 316L austenitic stainless steel. This distribution can be linked to the temperature and the strain rate by a phenomenological law with the Zener-Hollomon parameter. This approach aims to revisit the nucleation law used in our mean field model by the direct introduction of the adequate RX grains size distribution linked to a Zener-Hollomon value.
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Dates et versions

hal-03875070 , version 1 (12-12-2022)

Identifiants

  • HAL Id : hal-03875070 , version 1

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Marion Roth, Marc Bernacki, Nathalie Bozzolo, Baptiste Flipon. An approach to get around the problem of properly describing nucleation in mean field modelling of recrystallization. Matériaux 2022, Oct 2022, Lille, France. ⟨hal-03875070⟩
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