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Abstract
Transmission electron microscopy has been used to study the damage structure of solution-annealed AISI type 316 steel irradiated in the Dounreay Fast Reactor at measured temperatures in the range 430—740°C to displacement doses of 6 and 16 dpa ( N 2 ). The structures observed are complex and are more sensitive to temperature than to dose. The dislocation and void components have been characterised quantitatively. The maximum temperature for void stability is about 600° C and the peak swelling temperature, which cannot be defined precisely from these experiments, is thought to lie between 400 and 450°C. These findings agree with published data from other unstressed reactor irradiations of this composition of steel but not with observations made on fast-reactor fuel-pin cladding. The results are compared with the damage structures generated in steel of the same cast exposed to heavy ion and electron bombardment in accelerated voidage experiments.
Published Version
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