Elsevier

Scripta Materialia

Volume 164, 15 April 2019, Pages 66-70
Scripta Materialia

Improving creep resistance of nickel-based superalloy Inconel 718 by tailoring gamma double prime variants

https://doi.org/10.1016/j.scriptamat.2019.01.041Get rights and content

Abstract

Inconel 718 is a widely used nickel-based superalloy in aircraft engines during the past decades, whose elevated temperature strength derives from disc-shaped gamma double prime (γ″) in three perpendicular variants plus less spherical gamma prime (γ′) precipitates. In present work, we observed an abnormal γ″ variant with tailored orientation and shape in directly aged cold-rolled Inconel 718, creep tests proved its substantial benefits in improving creep resistance at 650 °C superior to commonly perpendicular γ″ variants. The results can provide new insights for processing optimization and second-particle configuration design to maximize the strengthening effect of γ″ phase in 718-type superalloys.

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Acknowledgements

This research was financially supported by the National Natural Science Foundation of China (granted Nos. 51474156, 51604193 and U1660201), and the National High Technology Research and Development Program (863 Program) of China (Granted No. 2015AA042504).

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