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Characterization of Strain-Induced Precipitation in Inconel 718 Superalloy

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Abstract

Inconel 718 presents excellent mechanical properties at high temperatures, as well as good corrosion resistance and weldability. These properties, oriented to satisfy the design requirements of gas turbine components, depend on microstructural features such as grain size and precipitation. In this work, precipitation-temperature-time diagrams have been derived based on a stress relaxation technique and the characterization of precipitates by scanning electron microscopy. By using this methodology, the effect of strain accumulation during processing on the precipitation kinetics can be determined. The results show that the characteristics of precipitation are significantly modified when plastic deformation is applied, and the kinetics are slightly affected by the amount of total plastic deformation.

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Acknowledgments

The authors thank the Spanish “Ministerio de Ciencia en Innovación” for its financial support through the Project PID-560300-2009-11 and Sheyu Shu and Antonio Gámez for their experimental work contribution.

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Authors and Affiliations

  1. Departament de Ciència dels Materials i Enginyeria Metal lúrgica, Universitat Politècnica de Catalunya, Av. Diagonal 647, pabellón E, 08028, Barcelona, Spain

    Jessica Calvo & José María Cabrera

  2. CTM Centre Tecnològic, Plaça de la Ciència, 2, 08243, Manresa, Spain

    Jessica Calvo & José María Cabrera

  3. Tecnalia Research & Innovation, Paseo Mikeletegi, 7, 20009, San Sebastián, Spain

    Mariluz Penalva

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  1. Jessica Calvo
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  2. Mariluz Penalva
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  3. José María Cabrera
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Correspondence to Jessica Calvo.

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Calvo, J., Penalva, M. & Cabrera, J.M. Characterization of Strain-Induced Precipitation in Inconel 718 Superalloy. J. of Materi Eng and Perform 25, 3409–3417 (2016). https://doi.org/10.1007/s11665-016-2154-9

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  • DOI: https://doi.org/10.1007/s11665-016-2154-9

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