Impact of high-pressure hydrogen charging on mechanical behavior and lattice parameters of a polycrystalline CoNiCr-based superalloy

Nagel O, Fritton M, Mutschke A, Spörlein M, Stark A, Sheptyakov D, Höschen C, Felfer P, Gilles R, Neumeier S (2025)

Publication Type: Journal article

Publication year: 2025

Journal

Scripta Materialia Elsevier

Book Volume: 260

Pages Range: 116594

Article Number: 116594

DOI: 10.1016/j.scriptamat.2025.116594

Abstract

Due to the increasing significance of hydrogen in future applications, it is crucial to address the potential effects of hydrogen on material safety in hydrogen-rich environments. Detecting hydrogen remains challenging. In this study, we provide an explanation for hydrogen embrittlement in a CoNiCr-based superalloy using a combination of NanoSIMS measurements, synchrotron and neutron diffraction, and analysis of fractured tensile samples from hydrogen-charged specimens. NanoSIMS mappings and diffraction experiments revealed the highest hydrogen concentration inside precipitates of the µ phase. Neutron diffraction experiments indicate that the γ′ phase slightly incorporates more hydrogen than the γ phase, therefore expands comparatively more and thus, the positive γ/γ′-lattice misfit increases a little. This results in a strong influence of hydrogen on the mechanical properties of hydrogen as revealed by tensile tests. Hydrogen inside µ phase particles and at γ/γ′-interfaces leads to pronounced crack initiation at γ/µ-interfaces and facilitates crack propagation along weakened γ/γ′-interfaces.

Authors with CRIS profile

Oliver Nagel Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Martin Spörlein Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Peter Felfer Professur für Atom Probe Tomography Steffen Neumeier Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Involved external institutions

Technische Universität München (TUM) DE Germany (DE) Helmholtz-Zentrum Hereon DE Germany (DE) Paul Scherrer Institute (PSI) CH Switzerland (CH)

How to cite

APA:

Nagel, O., Fritton, M., Mutschke, A., Spörlein, M., Stark, A., Sheptyakov, D.,... Neumeier, S. (2025). Impact of high-pressure hydrogen charging on mechanical behavior and lattice parameters of a polycrystalline CoNiCr-based superalloy. Scripta Materialia, 260, 116594. https://doi.org/10.1016/j.scriptamat.2025.116594

MLA:

Nagel, Oliver, et al. "Impact of high-pressure hydrogen charging on mechanical behavior and lattice parameters of a polycrystalline CoNiCr-based superalloy." Scripta Materialia 260 (2025): 116594.

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