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The effect of pulse irradiation on the swelling of Fe-17Cr-17Ni-2.5Mo alloy has been investigated in the present work. Ion species are 4 MeV Ni++ and 0.2–0.4 MeV He+. Irradiation temperatures were 843 and 1023K. Pulsing irradiation is the series of 0.5s beam on/ 0.5s beam off (fast pulse) or that of 60s beam on/ 60s beam off (slow pulse). In the case of no He injection, the pulse irradiation suppressed completely the formation and growth of cavities at the irradiation temperature of 1023K. For the case of He preinjection at the higher irradiation temperatures, the pulse irradiation restrained the growth of cavities but increased the number density of cavities. The effect of dual beam pulse irradiation at 843K was small. The other interesting effect of pulse irradiation at 1023K was to inhibit the occurrence of bimodal distributions of cavities (suppressing the large ones) which are otherwise observed with either He preinjection or simultaneous injection.
316 stainless steel, pulse irradiation, dual beam irradiation, void swelling, cavities, first wall materials, fusion reactor
Research associate, University of Tokyo, Tokyo,
Scientist, Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN
Professor, University of Tokyo, Tokyo,