Characterization and modeling of the influence of initial microstructure on recrystallization of Zyrcaloy-4 during hot forming - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2022

Characterization and modeling of the influence of initial microstructure on recrystallization of Zyrcaloy-4 during hot forming

Victor Grand
Alexis Gaillac
  • Fonction : Auteur
Baptiste Flipon
Marc Bernacki

Résumé

Manufacturing parts made of zirconium alloy that fulfill the high requirements of nuclear applications require to understand and master all the processing steps, from extraction to thermomechanical processing. Every operation should be designed carefully to ensure that the shape and microstructure are suited to the following process and respect the final requirements. It is now established that recrystallization and recovery mechanisms play a significant role in microstructure evolutions during hot forming. Several studies have focused on thermomechanical behavior of zirconium alloys and its link to microstructure evolutions. However, since Zircaloy-4 exhibits a quite complex microstructure, only a few quantitative experimental data about recrystallization are available. Moreover, only simple mean field models (i.e. that represent microstructure thanks to averaged variables) or phenomenological models are discussed in the state of the art concerning microstructure prediction for this material. Hence, we propose to take advantage of recent advances in full field numerical models (that represent explicitly microstructure at mesoscopic scale) to understand the influence of specific features on recrystallization of Zircaloy-4. To do so, an experimental campaign composed of thermomechanical tests under various conditions has been designed to acquire the required data in order to calibrate models and provide reference values for evaluation of simulation results. Using advanced simulation frameworks that are available today, we expect to assess the influence of features of interest such as second phase particles, diverse grain morphologies (i.e. equiaxed, lamellar) and anisotropy of grain boundaries. Finally, some adaptations of the actual formulations will be compared and discussed to model continuous dynamic recrystallization as it has been shown to be the major recrystallization mechanism considering industrial processing of Zircaloy-4.
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Dates et versions

hal-03876010 , version 1 (08-12-2022)

Identifiants

  • HAL Id : hal-03876010 , version 1

Citer

Victor Grand, Alexis Gaillac, Baptiste Flipon, Marc Bernacki. Characterization and modeling of the influence of initial microstructure on recrystallization of Zyrcaloy-4 during hot forming. 20th International Symposium on Zirconium in the Nuclear Industry, Jun 2022, Ottawa, Canada. ⟨hal-03876010⟩
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