Abstract
Microstructural evolution of super-clean reduced-activation martensitic steels irradiated with single-beam (Fe+) and sequential-beam (Fe+ plus He+) at 350°C and 550°C was studied. Sequential-beam irradiation induced smaller size and larger number density of precipitates compared to single-beam irradiation at 350°C. The largest size of cavities was observed after sequential-beam irradiation at 550°C. The segregation of Cr and W and depletion of Fe in carbides were observed, and the maximum depletion of Fe and enrichment of Cr occurred under irradiation at 350°C.
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