Abstract
Specimens of ferritic/martensitic (FM) steel Eurofer 97 were irradiated to doses ranging from 9.5dpa/760appm He to 20.4dpa/1795appm He at temperatures between 150 and 360°C in the second experiment of the SINQ Target Irradiation Program (STIP-II). The results of tensile tests and hardness measurements demonstrated strong effect of irradiation-induced hardening and embrittlement in the steel. Specimens irradiated to 19.8dpa/1750appm He at 345°C exhibited a fully brittle fracture mode regardless testing at 25 or 400°C. Transmission electron microscopy (TEM) investigation showed that the visible defect features produced by irradiation were mainly small clusters and dislocation loops. High-density helium bubbles with sizes of 1–3nm were also observed in the specimens irradiated to 20.4dpa/1795appm He.
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