Oxidation Behavior of the Polycrystalline Ni-Base Superalloy VDM® Alloy 780

Kirchmayer A, Weiser M, Randelzhofer P, Freund L, Gehrmann B, Haghighat MH, Huenert D, Göken M, Neumeier S (2023)

Publication Type: Journal article

Publication year: 2023

Journal

DOI: 10.1007/s11661-022-06956-z

Abstract

VDM® Alloy 780 is a newly developed polycrystalline Ni-base superalloy with high contents of Co, Cr, and Al intended for operating temperatures up to 750 °C. The alloy is precipitation strengthened by the γ′ phase, which is analyzed by atom probe tomography. Additionally, δ and η phases are utilized for grain boundary pinning. It is shown that the δ and η phases precipitate either plate like or in a fine lamellar structure inside each other. VDM® Alloy 780 shows superior oxidation resistance in comparison with Udimet 720Li and A718Plus, as seen by a lower mass gain and thinner oxide layers at 800 °C and 900 °C. This superior behavior is analyzed in detail by TEM and STEM investigations of the oxide scales from which it is concluded that the Al/Ti ratio in these alloys plays an important role on the oxidation behavior.

Authors with CRIS profile

Additional Organisation(s)

Involved external institutions

VDM Metals International GmbH Germany (DE) Forschungszentrum Jülich / Research Centre Jülich (FZJ) Germany (DE)

How to cite

APA:

Kirchmayer, A., Weiser, M., Randelzhofer, P., Freund, L., Gehrmann, B., Haghighat, M.H.,... Neumeier, S. (2023). Oxidation Behavior of the Polycrystalline Ni-Base Superalloy VDM® Alloy 780. Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science. https://dx.doi.org/10.1007/s11661-022-06956-z

MLA:

Kirchmayer, Andreas, et al. "Oxidation Behavior of the Polycrystalline Ni-Base Superalloy VDM® Alloy 780." Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science (2023).

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