Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7963299 | Journal of Nuclear Materials | 2018 | 12 Pages |
Abstract
The objective of this study is to evaluate the effects of irradiation dose and dose rate on defect cluster (i.e. dislocation loops and voids) evolution in a model Fe-9%Cr oxide dispersion strengthened steel and commercial ferritic-martensitic steels HCM12A and HT9. Complimentary irradiations using Fe2+ ions, protons, or neutrons to doses ranging from 1 to 100 displacements per atom (dpa) at 500â¯Â°C are conducted on each alloy. The irradiated microstructures are characterized using transmission electron microscopy (TEM). Dislocation loops exhibit limited growth after 1 dpa upon Fe2+ and proton irradiation, while any voids observed are small and sparse. The average size and number density of loops are statistically invariant between Fe2+, proton, and neutron irradiated specimens at otherwise fixed irradiation conditions of â¼3 dpa, 500â¯Â°C. Therefore, we conclude that higher dose rate charged particle irradiations can reproduce the neutron irradiated loop microstructure with temperature shift governed by the invariance theory; this temperature shift is â¼0â¯Â°C for the high sink strength alloys studied herein.
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Physical Sciences and Engineering
Energy
Nuclear Energy and Engineering
Authors
M.J. Swenson, J.P. Wharry,