TY - JOUR
T1 - Fatigue properties of ferritic/martensitic steel after neutron irradiation and helium implantation
AU - Nogami, Shuhei
AU - Hasegawa, Akira
AU - Yamazaki, Masanori
N1 - Funding Information:
Authors are grateful to all the staffs of Cyclotron and Radioisotope Center (CYRIC) of Tohoku University for their operation of the Cyclotron accelerator. Authors are also grateful to all the staffs of International Research Center for Nuclear Materials Science, Institute for Materials Research, Tohoku University for their support of the neutron irradiation using BR2 and fatigue tests in their hot laboratory.
PY - 2020/8
Y1 - 2020/8
N2 - 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.
AB - 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.
KW - Fatigue life
KW - Helium implantation
KW - Neutron irradiation
KW - Reduced activation ferritic/martensitic steel
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U2 - 10.1016/j.nme.2020.100764
DO - 10.1016/j.nme.2020.100764
M3 - Article
AN - SCOPUS:85086745645
VL - 24
JO - Nuclear Materials and Energy
JF - Nuclear Materials and Energy
SN - 2352-1791
M1 - 100764
ER -