ISIS Neutron and Muon Source Data Journal

Effect of hydrogen charging on the interphase microstrains and stacking fault energies of ?'-hardened single crystal superalloys

Abstract: The use of hydrogen as a zero-carbon energy source presents challenges due to its interaction with structural materials, particularly in gas turbine engines. This study examines the effects of hydrogen charging on interphase microstrains and stacking fault energy (SFE), which influence the deformation behavior of ??-hardened single crystal (SX) superalloys. These superalloys, with a face-centered cubic (FCC) ? matrix and embedded ?? precipitates, are critical for high-temperature turbine applications but have been understudied regarding hydrogen?s effects beyond embrittlement. Elastic microstrains arise from the lattice misfit between the two phases, depending on the magnitude and difference in their lattice parameters. In this research, three SX superalloys are studied: Ni-based CMSX-4 (small negative lattice misfit), LDSX6-A (large negative lattice misfit), and Co-based VF60 (positive lattice misfit). In situ neutron diffraction is employed to measure lattice parameters, interphase microstrains, and SFE during compression tests, both before and after hydrogen charging at 1000 bar and 300°C. Previous studies suggest hydrogen uptake lowers SFE, and this research aims to compare the SFE of hydrogen-free and hydrogen-charged samples to further understand hydrogen's influence on SFE. These findings contribute to the understanding of hydrogen?s effects on high-temperature alloys, with implications for their future use in hydrogen-powered systems.

Principal Investigator: Mr Oliver Nagel
Experimenter: Dr Steffen Neumeier
Experimenter: Dr Alexander Mutschke
Local Contact: Dr Joe Kelleher
Experimenter: Mrs Bianca Grandjean
Experimenter: Dr Ralph Gilles
Experimenter: Dr Massimo Fritton
Experimenter: Professor Howard Stone
Experimenter: Dr George Wise

DOI: 10.5286/ISIS.E.RB2510457

ISIS Experiment Number: RB2510457

Publisher: STFC ISIS Neutron and Muon Source

Data format: RAW/Nexus
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Data Citation

The recommended format for citing this dataset in a research publication is as:
[author], [date], [title], [publisher], [doi]

For Example:
Mr Oliver Nagel et al; (2025): Effect of hydrogen charging on the interphase microstrains and stacking fault energies of ?'-hardened single crystal superalloys, STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2510457

Data is released under the CC-BY-4.0 license.