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Effect of very high temperature short exposures on the dissolution of the γ′ phase in single crystal MC2 superalloy

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Abstract

Time-temperature dependence of the γ′ phase volume fraction was investigated for a second generation single crystal nickel-based superalloy exposed to very short high temperature regimes (1,100–1,200 °C). In this temperature range, the dissolution of the strengthening γ′ phase occurs. Evolution of the γ′ volume fraction in transient regimes has been established for each temperature and activation energy of the dissolution phenomenon were determined. They directly attest from the activity of the diffusing species involved during this phenomenon. From these analyses, the volume fraction at equilibrium was established for the entire temperature range where dissolution occurs. A model, based on a time/temperature equivalence, is proposed to quantify the γ′ volume fraction dissolved during short high temperature exposure.

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Acknowledgements

The authors acknowledge financial support from la Délégation Générale de l’Armement (DGA) and TURBOMECA—groupe SAFRAN company, which is also acknowledged for providing the material. The authors would also like to thanks P. CARON (ONERA) for thermal treatments carried out until thermodynamic equilibrium. A. GLAD is gratefully acknowledged for English suggestions.

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  1. Laboratoire de Mécanique et Physique des Matériaux, UMR CNRS 6617, ENSMA, BP 40109, Futuroscope Chasseneuil Cedex, Poitiers, 86961, France

    Jonathan Cormier, Xavier Milhet & Jose Mendez

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  1. Jonathan Cormier
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  2. Xavier Milhet
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  3. Jose Mendez
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Correspondence to Jonathan Cormier.

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Cormier, J., Milhet, X. & Mendez, J. Effect of very high temperature short exposures on the dissolution of the γ′ phase in single crystal MC2 superalloy. J Mater Sci 42, 7780–7786 (2007). https://doi.org/10.1007/s10853-007-1645-3

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  • DOI: https://doi.org/10.1007/s10853-007-1645-3

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