ISIS Neutron and Muon Source Data Journal

Revealing the interaction of residual strain ? mechanical performance using in situ neutron diffraction at high temperature for similar and dissimilar Eurofer97 joints

Abstract: Nuclear fusion is a potential source of electricity which can address the environmental problems posed by fossil fuels. The UK?s Spherical Tokamak for Energy Production (STEP) has progressed to the second stage, as of 2024, from the concept design to the engineering design. Eurofer97 steel is a primary structural material for in-vessel components in fusion Tokamaks. Assembling and maintaining works are necessary for the structural integrity of these in-vessel components in high-temperature working conditions. This requires joining techniques, forming similar and dissimilar Eurofer97 joints and inducing immense residual stress. The interaction of the residual strain and the heterogeneous microstructure degrades the mechanical performance and reduces the lifetime of these critical components. To mitigate the detrimental effects of residual strain within the Eurofer97 similar and dissimilar joints, research must be conducted to reveal the fundamental understanding of (i) the origins of residual strain inherited from the joining process and its interaction with the high temperature, and (ii) underpinning deformation mechanism associated with the residual strain at high temperature. The results obtained from the current study will enhance the design protocols and structural integrity assessment of the EU DEMO and UK STEP (Spherical Tokamak for Energy Production) fusion power plants.

Principal Investigator: Dr Bin Zhu
Experimenter: Dr Tan Sui
Local Contact: Dr Tung Lik Lee
Experimenter: Dr Yiqiang Wang
Experimenter: Mr Brandon Steel
Experimenter: Dr Mark Whiting
Experimenter: Ms Uyanga Jargalsaikhan
Experimenter: Mr David England
Experimenter: Mr Tony Fry
Experimenter: Dr Abdalrhaman Mohamed
Experimenter: Dr Nathanael Leung

DOI: 10.5286/ISIS.E.RB2510008

ISIS Experiment Number: RB2510008

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:
Dr Bin Zhu et al; (2025): Revealing the interaction of residual strain ? mechanical performance using in situ neutron diffraction at high temperature for similar and dissimilar Eurofer97 joints , STFC ISIS Neutron and Muon Source, https://doi.org/10.5286/ISIS.E.RB2510008

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