Abstract
Swelling behavior of solution annealed Type 316L stainless steel with 0.005 wt% carbon and 0.018 wt% nitrogen during electron irradiation at temperatures of 673 to 873 K was continuously observed with a high voltage electron microscope. Peak swelling of 4.2% occurred at 823 K in the 30 dpa irradiation for 316L steel. Addition of 0.08 wt% nitrogen to the steel reduced both the void number density and growth rate below 873 K; therefore, the resultant swelling was less than half that in the 316L at 30 dpa. Addition of 0.08 wt% carbon to the 316L steel drastically suppressed void formation at 823 K and above; no swelling was observed up to a dose of 30 dpa at the high temperatures. The swelling at 823 K was much less in the steel with both 0.08 wt% carbon and 0.08 wt% nitrogen than in the 316L steel or the steel with 0.08 wt% nitrogen alone.
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