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Poster De Conférence Année : 2022

Role of γ’ precipitates in recrystallization during forging of γ-γ’ superalloys

Federico Orlacchio
  • Fonction : Auteur
  • PersonId : 1195846
Chi-Toan Nguyen
  • Fonction : Auteur
  • PersonId : 1195847
Marc Bernacki

Résumé

Polycrystalline nickel base γ-γ' superalloys show a trimodal distribution of the γ' phase in the form of precipitates. The γ' precipitates contribute importantly to the strength and to the control of the γ grain sizes via recrystallization. In this alloy family, in fact, recrystallization phenomena are strongly affected by the presence of the γ' phase through various complex mechanisms. The γ' precipitates can indeed promote heteroepitaxial recrystallization, or hinder recrystallization, or hinder the migration of the recrystallization front, or be dissolved into the recrystallization front. The objective of the work presented is to better understand these complex interactions. A hot thermo-mechanical test campaign was defined to analyse the impact of γ' precipitates on the volume fraction and size of the recrystallized grains for a given set of deformation conditions, and to analyse the main involved mechanisms. Hot compression and torsion tests were thus performed on samples with different initial precipitation states to link the recrystallization mechanisms with the γ' precipitates present in the initial microstructure. Based on these experimental observations, a quantitative and qualitative analysis of the role of γ' precipitation on recrystallization mechanism for the γ-γ' family of nickel-based superalloys will be provided as well as a comparison with results reported in the literature.
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Dates et versions

hal-03875960 , version 1 (28-11-2022)

Identifiants

  • HAL Id : hal-03875960 , version 1

Citer

Federico Orlacchio, Daniel Pino Muñoz, Chi-Toan Nguyen, Marc Bernacki, Nathalie Bozzolo. Role of γ’ precipitates in recrystallization during forging of γ-γ’ superalloys. 4th European Symposium on Superalloys and their Applications (EuroSuperalloys 2022), Sep 2022, Bamberg, Germany. ⟨hal-03875960⟩
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