Abstract
HAYNES® 282® alloy was developed by Haynes International as an age-hardenable, yet fabricable, wrought Ni-base superalloy . To date, the alloy has been specified for a number of applications , most notably in the hot sections of both aero- and industrial gas turbines. A Time-Temperature -Transformation (TTT) diagram is a useful guide to assess an alloy’s behavior during thermo-mechanical processing and heat treating. Starting with the (commercially relevant) 1149 °C (2100 °F) mill-annealed condition, a time (0.1–100 h)—temperature (649–1121 °C (1200–2050 °F)) exposure matrix was executed. Precipitates, which had formed as a result of these exposures, were analyzed by light microscopy, scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS), and, in selected cases, by x-ray diffraction (XRD ). Chiefly, γ′ and two types of carbides, Cr-rich M23C6 and Mo-rich M6C, were found. Approximate C-curves for these phases were constructed, and some implications for the alloy’s processing and properties characteristics are discussed.
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Acknowledgements
J. Schrader, M. A. Richeson, J. A. Ryan, B. North, and J. P. Cotner are thanked for sample preparation and detailed LM/SEM/EDS/XRD work. Helpful discussions with D. A. Metzler are acknowledged.
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Fahrmann, M.G., Pike, L.M. (2018). Experimental TTT Diagram of HAYNES 282 Alloy. In: Ott, E., et al. Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-89480-5_37
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DOI: https://doi.org/10.1007/978-3-319-89480-5_37
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