Abstract
It is of interest in fast breeder reactor design to know whether saturation of void-related swelling in stainless steel occurs at high neutron fluences. One factor which may preclude saturation is a coarsening of the void structure, which would essentially reduce the rate of decrease of intervoid spacing. The HEDL JEM-1000 electron microscope was used to produce very high equivalent neutron fluences by irradiating an annealed Type 316 stainless steel specimen with 1 MeV electrons at 600°C; stereomicrographs made at regular fluence increments were used to determine the nature and extent of void coarsening reactions. The specimen did not contain helium, so the void distribution is inherently more coarse (larger mean void size, lower void concentration) than would be the case for neutron irradiation.
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