Fatigue properties of F82H irradiated at 523 K to 3.8 dpa

Fatigue properties were examined on a reduced activation ferritic/martensitic steel (F82H), and preliminary results are presented. F82H steel was irradiated at 523 K to 3.8 dpa, and then fatigue-tested at 298–573 K in vacuum with total strain range of 0.4–1.0%. The fatigue life of the irradiated specimen tested at 298 K with total strain range of 0.4% was revealed to be reduced to about 1/7 of that for the unirradiated specimen. The reduction of the fatigue life was attributed to the change of the fatigue mechanism to the channel fracture. The effect of test temperature is also discussed.