Tailoring the γ-γ'-γ" dual superlattice microstructure of INCONEL® 725 by high temperature aging and Nb/Ta additions for superior creep properties

Antonov, Stoichko; Hung, Chang-Yu; Hawk, Jeffrey; Jablonski, Paul; Detrois, Martin

doi:10.1007/978-3-031-27447-3_10

Tailoring the γ-γ'-γ" dual superlattice microstructure of INCONEL® 725 by high temperature aging and Nb/Ta additions for superior creep properties

Conference · 23 May 2023

DOI:https://doi.org/10.1007/978-3-031-27447-3_10· OSTI ID:1975788

Antonov, Stoichko ^[1]; Hung, Chang-Yu ^[2]; Hawk, Jeffrey ^[1]; Jablonski, Paul ^[1]; Detrois, Martin ^[1]

NETL
NETL Site Support Contractor, National Energy Technology Laboratory

Next-generation energy systems require superior resistance to creep deformation due to the considerably prolonged exposure times at operating stress and temperature. To improve the elevated temperature properties of INCONEL® 725 (IN725), a corrosion resistant alloy, several variants with different Ti/Al ratio and judicious amounts of Nb and Ta were made. Furthermore, a high temperature aging (HTA) heat treatment, designed to promote favorable precipitate phase formation, was explored. These adjustments allowed to tailor the amount and type of precipitate strengthening which led to significant increases in time to failure. The Ti/Al ratio was used to favor the formation of γ' or γ" precipitates. Compact morphology precipitates, consisting of γ' precipitates surrounded by a γ" shell, were formed in alloys with a low Ti/Al ratio. The HTA increased the creep life of various alloy formulations up to a maximum improvement of 371% as compared to the standard aging heat treatment. The Nb and Ta additions had a similar effect on increasing creep life by promoting and stabilizing γ" precipitation. The positive effect of the additions was even more pronounced when coupled with the HTA. A phase stability study with up to 10,000 h exposure at 700°C revealed that the compact morphology helped in slightly reducing coarsening of the γ' precipitates, although the effect on creep was not significant. The findings of this study enable design of dual superlattice alloys through microstructural engineering that yields superior performance and can be applied to a wide range of alloys in the IN718 and derivatives family.

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Research Organization:: National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

DOE Contract Number:: Other

OSTI ID:: 1975788

Resource Relation:: Conference: Conference Name: The Superalloy 718 & Derivatives 2023 conference Location: Pittsburgh, Pennsylvania, United States Start Date: 5/14/2023 12:00:00 AM End Date: 5/17/2023 12:00:00 AM

Country of Publication:: United States

Language:: English

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