Abstract
The effects of dose rate on void swelling and precipitation behaviour during irradiation were examined in type 316 stainless steel and the Japanese prime candidate alloy for a fusion reactor first wall (J-PCA). The specimens were irradiated at 823 K by 200 keV protons to 20 dpa at a dose rate of 2.0 × 10 −4dpa/s for 0.1 Ms (28 h) and 1.5 × 10 −5 dpa/s for 1.37 Ms (380 h), respectively. Notable differences in swelling and precipitation behaviour were not observed between the high and low dose rate irradiations in type 316 stainless steel. In the J-PCA, on the other hand, the low dose rate irradiation showed much lower swelling and a much greater amount of intragranular TiC precipitation than the high dose rate irradiation for both solution-annealed and cold-worked conditions.
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