Journal Article

IMPULSE-2025-00069

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Impact of high-pressure hydrogen charging on mechanical behavior and lattice parameters of a polycrystalline CoNiCr-based superalloy

Nagel, O. (Corresponding author) ; Fritton, M.MLZ* ; Mutschke, A.MLZ* ; Spörlein, M. ; Stark, A. ; Sheptyakov, D. ; Höschen, C. ; Felfer, P. ; Gilles, R.MLZ* ; Neumeier, S.

2025
Elsevier Science Amsterdam [u.a.]

Please use a persistent id in citations: 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.

Keyword(s): Engineering, Industrial Materials and Processing (1st) ; Materials Science (2nd)

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Contributing Institute(s):

1. ADVMAT (ADVMAT)

Research Program(s):

1. 05K22WO3 - Verbundprojekt 05K2022 - H2Mat: Ein Gerät zur Untersuchung des Einflusses der Wasserstoffbe- und -entladung für industriell entwickelte und verwendete Legierungen. Teilprojekt 1. (BMBF-05K22WO3) (BMBF-05K22WO3)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2025

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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