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Precipitate-free zones formation at grain boundaries in γ/γ′ Ni-based superalloys

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Abstract

Formation and growth of secondary γ′ precipitate-free zones (PFZ) in the vicinity of grain boundaries in five Ni-based superalloys have been investigated for different heat treatment times and temperatures. A special focus has been placed on a high carbon containing version of the AD730™ alloy. While the formation of PFZ is induced by the precipitation of Ti-rich secondary carbides during aging in Nimonic PE16, it has been shown in the present study that PFZ mainly form during close-to-γ′-solvus heat treatments and are associated with the nucleation of intergranular γ′ precipitates in the studied alloys. Since these precipitates have chemical compositions similar to intragranular secondary γ′ particles, depletion of precipitate-forming elements leads to the dissolution of intragranular secondary γ′ precipitates near grain boundaries and finally to the formation of PFZ. PFZ width evolutions have been described using a parabolic model, and their kinetics obey an Arrhenius-type law indicating a diffusion-controlled process. Thanks to chemical composition analyzes in and near the PFZ, it is shown that both titanium and niobium diffusion, in volume and through the grain boundaries, could be controlling the PFZ formation.

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Data (SEM/TEM micrographs and data tables) and codes (post-treatment files) are available upon request.

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Acknowledgements

The work received financial support from the Industrial Chair ANR-SAFRAN TOPAZE (ANR-19-CHIN-0005). Institut Pprime gratefully acknowledges the "Contrat de Plan Etat—Région Nouvelle-Aquitaine" (CPER) as well as the "Fonds Européen de Développement Régional” (FEDER) for their financial support to part of the reported work. The authors acknowledge financial support from the "Centre National de la Recherche Scientifique—Comissariat à l’Energie Atomique, Microscopie Electronique en Transmission et Sonde Atomique” (CNRS-CEA METSA) French network (FR CNRS 3507) on the "Institut de Recherche des Matériaux avancés—Groupe de Physique des Matériaux" (IRMA-GPM) platform for the Atomic Probe Tomography experiments. The authors gratefully acknowledge Safran Aircraft Engines and Aubert & Duval for providing the alloys used in this study. The authors would like to thank Dr. Daniel Galy and Dr. Edern Menou from Safran Tech, respectively, for their help on EDS-X analyses and for the ThermoCalc simulations, Dr. Hadi Bahsoun from Institut Pprime for Dual Beam FIB extraction, Dr. Ivan Blum from Groupe de Physique des Matériaux for the help in APT experiments, Fabio Machado Alves da Fonseca, PhD student at Institut Pprime/Safran Tech, for reviewing the first draft and for his help in the understanding of diffusion mechanisms. Maggie Elliott, English Professor at ISAE-ENSMA, is gratefully acknowledged for editing our manuscript.

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  1. Institut Pprime, UPR CNRS 3346, ISAE-ENSMA – Teléport 2, University of Poitiers, 1 Avenue Clément Ader, BP 40109, 86961, Futuroscope Chasseneuil CEDEX, France

    Guillaume Burlot, Jonathan Cormier & Patrick Villechaise

  2. Institut Pprime, UPR CNRS 3346, SP2MI – Teléport 2, University of Poitiers, 11 Boulevard Pierre et Marie Curie, BP 30179, 86962, Futuroscope Chasseneuil CEDEX, France

    Dominique Eyidi

  3. Groupe de Physique des Matériaux, UMR CNRS 6634, INSA Rouen, Normandy University, UNIROUEN, Avenue de l’Université, 76800, Saint-Etienne du Rouvray, France

    Emmanuel Cadel

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Guillaume Burlot was involved in the conceptualization, methodology, investigation, data curation, formal analysis, and writing–original draft. Dominique Eyidi contributed to the methodology, investigation, data curation, and writing—review and editing. Emmanuel Cadel assisted in the investigation, data curation, and writing—review and editing. Jonathan Cormier was involved in the methodology, data curation, conceptualization, formal analysis, resources, supervision, funding acquisition, and writing—review and editing. Patrick Villechaise contributed to the methodology, data curation, conceptualization, supervision, formal analysis, funding acquisition, and writing—review and editing.

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Burlot, G., Cormier, J., Eyidi, D. et al. Precipitate-free zones formation at grain boundaries in γ/γ′ Ni-based superalloys. J Mater Sci 59, 10485–10507 (2024). https://doi.org/10.1007/s10853-024-09777-0

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