Abstract
Type-304 stainless steel specimens irradiated in EBR-II were examined by transmission electron microscopy. The neutron fluences ranged from 0.7 to 5.4×10 22 neutrons/cm 2 ( E>0.1 MeV) and the temperatures from 400 to 690 °C. Void sizes, size distributions, number densities, and volume fractions were determined and correlated with the irradiation history. Average, minimum and maximum void diameters increased, and void number density decreased with increasing irradiation temperature to 650 °C. Extremely large voids (>2000 Å diameter) were found in specimens irradiated above 500 °C. The curve of void volume fraction versus temperature had a plateau that extended from approximately 450 to 600 °C and suddenly dropped to zero at about 650 °C; above that temperature no voids were found. The results are discussed in terms of void nucleation and growth.
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