Reveal residual stress-mechanical performance interaction of laser-welded Eurofer97 via in-situ neutron diffraction
To facilitate Remote Maintenance (RM) of demonstration fusion plant, the RM teams at Culham Centre for Fusion Energy (CCFE) utilise lasers to join EUROFER97 components. However, this rapid welding process generates significant residual stresses inside the polycrystalline materials. The heterogeneous residual stresses can associate with the elastic-plastic anisotropy at the grain scale, leading to Bauschinger effect and tension-compression asymmetry in polycrystalline materials. However, the mechanistic connections between the residual stresses and mechanical behaviour of laser-welded Eurofer97 steels remain unexplored. The current proposed study aims to a fundamental understanding the underpinning deformation mechanism associated with strain softening and residual stresses of laser-welded Eurofer97. The correlations between microstructures and mechanical performance will also be conducted. This work contributes to the PhD of Bin Zhu, which is co-funded by Surrey Doctoral College Studentship in collaboration with CCFE/UKAEA. This proposal is resubmitted with significant improvements.
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WANG Yiqiang; LEUNG Nathanael; MOHAMED Omar; PIRLING Thilo; SUI Tan and ZHU Bin. (2021). Reveal residual stress-mechanical performance interaction of laser-welded Eurofer97 via in-situ neutron diffraction. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-02-342
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