Abstract
• Effects of displacement damage and helium on the fatigue life of F82H-IEA. • Degradation of fatigue life after the low temperature neutron irradiation. • Degradation of fatigue life after the high temperature helium implantation. The effects of displacement damage and helium on the fatigue life of the reduced activation ferritic/martensitic steel, F82H-IEA, were evaluated by fatigue tests at room temperature after neutron irradiation and helium implantation. Those effects at various test conditions, e.g., irradiation and implantation temperatures and applied strain in fatigue tests, were discussed using data from both literature and the present study. As for the fatigue life under plastic strain dominant conditions, the neutron-irradiated specimens, which were irradiated at 389–423 K, showed shorter fatigue life compared to the as-received ones. In contrast, the specimens neutron-irradiated at 573 K showed no degradation. As well as the specimens neutron-irradiated at relatively low temperature, the helium-implanted specimens, which were implanted at 743 K, showed shorter fatigue life. The decrease in fatigue life of specimens neutron-irradiated at relatively low temperatures could be caused by the irradiation hardening, while that of the specimen helium-implanted at relatively high temperatures could be caused by an embrittlement with no/small hardening.
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