Oxidation-controlled creep response of miniaturized Waspaloy specimens in a hydrogen-containing atmosphere

Nagel O, Tang C, Haußmann L, Demirci A, Vollath S, Fritton M, Gilles R, Göken M, Gorr B, Neumeier S (2026)

Publication Type: Journal article

Publication year: 2026

Journal

Book Volume: 265

Article Number: 116020

DOI: 10.1016/j.matdes.2026.116020

Abstract

Hydrogen-containing atmospheres are of growing interest for high-temperature applications, but their influence on the creep behavior of Ni-based superalloys remains difficult to assess under realistic conditions. In this study, the creep response of Waspaloy was investigated using miniaturized tensile specimens and related to oxidation behavior in Ar and Ar + 5 % H2 atmospheres. The applicability of the miniaturized creep approach was first assessed by comparison with conventional macroscopic specimens. At 925 °C and 120 MPa, macro and micro specimens showed broadly similar creep behavior during the short test durations, indicating that surface-related degradation did not dominate the overall response. At 875 °C and 80 MPa, the minimum creep rates remained similar in both atmospheres, whereas subsequent creep softening was delayed in Ar + 5 % H2. Complementary oxidation experiments at 875 °C revealed a thicker, more heterogeneous oxide scale with stronger internal oxidation in Ar, while Ar + 5 % H2 produced a thinner, more homogeneous oxide scale. These results show that the creep response of miniaturized specimens is strongly influenced by oxidation-induced surface degradation and the resulting reduction of the effective load-bearing cross section. A direct hydrogen effect on the high-temperature creep mechanism could not be conclusively identified.

Authors with CRIS profile

Involved external institutions

Technische Universität München (TUM) Germany (DE) Karlsruhe Institute of Technology (KIT) Germany (DE)

How to cite

APA:

Nagel, O., Tang, C., Haußmann, L., Demirci, A., Vollath, S., Fritton, M.,... Neumeier, S. (2026). Oxidation-controlled creep response of miniaturized Waspaloy specimens in a hydrogen-containing atmosphere. Materials & Design, 265. https://doi.org/10.1016/j.matdes.2026.116020

MLA:

Nagel, Oliver, et al. "Oxidation-controlled creep response of miniaturized Waspaloy specimens in a hydrogen-containing atmosphere." Materials & Design 265 (2026).

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