Abstract
The effect of helium on cavity formation in a ferritic/martensitic stainless steel was investigated by electron irradiation with the simultaneous implantation of helium or pre-injection of helium. The electron irradiation were carried for damage levels to 20 dpa at temperatures of 620–770 K using a HVEM/ion-accelerator irradiation facility. Large cavities were formed with low number density on electron irradiation, whereas pre-injection of helium followed by electron irradiation caused the number density of small size cavities to be increased. In the case of duel-beam irradiation, a bi-modal size distribution of large and small cavities developed with the number density increasing gradually with increase of dose. These results indicate that the helium continuously injected during dual-beam irradiation enhances the nucleation of subcritical cavities without suppressing the conversion to bias-driven cavities.
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