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Microstructural Evolutions During Thermal Aging of Alloy 625: Impact of Temperature and Forming Process

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Abstract

The microstructural evolutions occurring upon thermal aging of alloy 625 sheets were studied in the 823 K to 1173 K (550 °C to 900 °C) temperature range and for durations up to 2000 hours. TTT diagrams of the δ and γ″ phases were established based on high-resolution scanning electron microscopy and associated quantitative image analysis approaches. The evolutions of secondary carbide volume fraction were also characterized. It was observed that the precipitation domains of the γ″ and δ phases are, respectively, 823 K to 1023 K (550 °C to 750 °C) and 923 K to 1173 K (650 °C to 900 °C) and that the γ″ coarsening follows the LSW theory once these particles have an ellipsoidal morphology. The onset of grain growth, accompanied with an increase of the texture index, was observed at a temperature as low as 1173 K (900 °C). It results from the progressive dissolution of grain boundaries’ secondary carbides (especially M6C carbides) at this temperature, a process that favors a greater mobility of grain boundaries. It is also shown that the forming process (shear spinning), even after a relaxation heat treatment, enhances and stabilizes the precipitation of the δ phase compared to as-rolled + solution heat-treated sheets. It hence slows down the precipitation of the γ″ phase, a result that is in good agreement with a thermal aging that was performed under load (i.e., during a creep test).

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Acknowledgments

The SAFRAN group (Aircelle, Snecma, and Turbomeca companies) is gratefully acknowledged for financial support, for providing the material, and for L. Mataveli Suave Master thesis grant. One of the two anonymous reviewers is gratefully acknowledged for all his suggestions.

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Author notes

  1. Aurélie Soula (Metallic Materials Engineer)

    Present address: , 50 rue Pierre Curie, BP 50042, 78371, Plaisir Cedex, France

Authors and Affiliations

  1. Physics and Mechanics of Materials Department, Institut Pprime, UPR CNRS no. 3346, CNRS – Université de Poitiers – ISAE-ENSMA, 1 avenue Clément Ader, BP 40109, 86961, Futuroscope, Chasseneuil, France

    Lorena Mataveli Suave (Ph.D. Student), Jonathan Cormier (Associate Professor), Patrick Villechaise (Director of Research at CNRS), Aurélie Soula (Metallic Materials Engineer) & Denis Bertheau (Research Engineer at CNRS)

  2. Materials and Process Department, Aircelle – SAFRAN Group, route du pont VIII, 76700, Gonfreville-L’Orcher, France

    Lorena Mataveli Suave (Ph.D. Student)

  3. Materials, Processes and Investigations Department, Turbomeca – SAFRAN Group, 64511, Bordes Cedex, France

    Zéline Hervier (Mechanics of Materials Engineer)

  4. Materials and Process Department, Snecma – SAFRAN Group, Site de Villaroche, Rond-Point René Ravaud, 77550, Moissy-Cramayel, France

    Johanne Laigo (Forged Ni-based Alloys Engineer)

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  1. Lorena Mataveli Suave
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Correspondence to Jonathan Cormier.

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Manuscript submitted May 18, 2013.

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Suave, L.M., Cormier, J., Villechaise, P. et al. Microstructural Evolutions During Thermal Aging of Alloy 625: Impact of Temperature and Forming Process. Metall Mater Trans A 45, 2963–2982 (2014). https://doi.org/10.1007/s11661-014-2256-7

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