About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Synergistic Irradiation, Corrosion, and Microstructural Evolution in Nuclear Materials
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Presentation Title |
Effect of Ion Irradiated Microstructure on Molten Salt Corrosion of Hastelloy N |
Author(s) |
Hazel Gardner, Ryan Schoell, Jie Qiu, Fedi Fehri, Michael Moody, Peter Hosemann, Djamel Kaoumi, David Armstrong |
On-Site Speaker (Planned) |
Hazel Gardner |
Abstract Scope |
Nickel-based alloy Hastelloy-N was developed decades ago for structural applications in Molten Salt Reactors, where good radiation and corrosion resistance, and high temperature mechanical performance are required. In this study, Hastelloy-N was irradiated with 2 MeV Ni+ ions at 600°C to a peak damage of 10 dpa at ~0.6 microns depth. Both irradiated and non-irradiated regions were then exposed to FLiNaK molten-salt to substantiate the effect of the irradiation-induced microstructure on the molten-salt corrosion behavior of the alloy. The microstructure of the (i) as-received, (ii) irradiated, (iii) corroded, and (iv) irradiated-then-corroded material were characterized respectively using a combination of transmission electron microscopy and atom probe tomography. Ion irradiation alone is observed to cause a ~20% nano-hardness increase, and segregation of Si to dislocation loops and grain boundaries, and the formation of nanoscale Mo/Cr-rich carbides. Analysis of the irradiated and unirradiated alloy after exposure to the molten salt are also presented. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Copper / Nickel / Cobalt, Characterization |