Abstract
Austenitic stainless steel in conventional and ultrafine-grained states is studied by impact testing in an unirradiated condition and after neutron irradiation to 12 dpa at 350°C. We show that grain refinement provided higher resistance of the steel to the onset of evolving macrodefects (such as cracks) in irradiated state. Impact toughness of the coarse-grained steel notably degraded after irradiation, while the ultrafine-grained steel demonstrated better resistance of impact toughness to irradiation effect. This finding highlights the promising potential of ultrafine-grained steels to be used as advanced radiation resistant materials with enhanced mechanical performance.
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