Abstract
The tensile properties of 304 stainless steel were investigated after irradiation in the EBR-II to 1.1 × 10 22 n/cm 2 ( E > 0.1 MeV) at 540 ± 50 °C. Radiation hardening by dislocation loops and voids caused increases in yield strength to test temperatures as high as 820 °C. A corresponding ductility loss was also observed. Below one-half the absolute melting temperature, 0.5 T m , the ductility loss was found to be caused by plastic instability induced by the increased flow stress and reduced work hardening rates. Above 0.5 T m , helium embrittlement was thought to control ductility. Dislocation loops and voids do not appreciably alter the high temperature ductility.
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