Abstract
The effect of electron and neutron irradiation and post-radiation annealing on the properties of 12% chromium ferritic-martensitic low-activated EK-181 steel treated under various heat conditions has been studied using transmission electron microscopy and resistometry. Both electron and neutron irradiation of EK-181 steel in the 300–340 K temperature range result in radiation-induced solid solution separation during all subsequent heat treatments. Isochronous annealing in the 300–500 K temperature range causes additional solid solution separation. Nanoclusters of point defects with a size from 1.5 to 5 nm and a concentration of 5 × 1016 cm–3 have been observed after neutron irradiation at a fluence of (1–5) × 1019 cm–2. Thermal homogenization of the solid solution occurs above 650 K.
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