Abstract
The microstructure of type 316 austenitic stainless steel has been investigated following 14 MeV Ni-ion irradiation to 3.3× 10 16 ions/cm 2 (40 dpa peak damage) at temperatures from 450°C to 650°C. Specimens were prepared in cross section to allow analysis over the entire damage range, and the void parameters, dislocation structure, and precipitation response are reported. Heterogeneous void formation was observed in the absence of gas. The swelling curve from this study has been compared to that derived from helium preinjection work. It was found that helium shifts the peak swelling temperature upwards in excess of 100°C for similar damage rates. The precipitation response shows a marked change from small block/rod morphology at 450–550°C to Fe 2P thin lathe precipitates at 600–650°C. Void formation was detected only for the lower temperature range and was associated with the small block/rod precipitates.
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