About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Transmutation Effects in Fusion Reactor Materials: Critical Challenges & Path Forward
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Presentation Title |
Effect of Helium on Low-temperature Hardening/Embrittlement (LTHE) in Neutron Irradiated Isotopically Tailored RAFM Steels |
Author(s) |
Arunodaya Bhattacharya, Steven J Zinkle, Samara M Levine, Mark R Gilbert, Charles E Kessel, Hiroyasu Tanigawa |
On-Site Speaker (Planned) |
Arunodaya Bhattacharya |
Abstract Scope |
Reduced activation ferritic-martensitic (RAFM) steels are promising candidates for fusion first-wall/blanket structures. A major technical gap in understanding fusion-specific radiation damage is the high transmutation rates under the fusion neutron spectra as compared to fission neutrons. Here, different degradation scenarios associated with transmutation-induced helium generation in RAFM steels will be presented. Isotopic tailoring of F82H using 58/60Ni addition was used to stimulate helium generation during HFIR neutron irradiations up to ~86 dpa, >930 appm He. Based on HFIR data, the effect of He on low-temperature hardening and embrittlement (LTHE) will be elucidated. Irradiation hardening and ductility loss results are compared with historical He effect data from spallation neutron (SPN) irradiations, highlighting significant over-prediction of the effect of He on tensile properties after SPN irradiations as compared to test reactor irradiations on isotopically tailored steels. Microstructural understanding of the effect of He on LTHE of HFIR irradiated steels will be discussed. |
Proceedings Inclusion? |
Planned: |
Keywords |
Iron and Steel, Nuclear Materials, Mechanical Properties |