Fatigue Behavior of Domestic A508-3 Steel under Simulated AP1000 Primary Coolant Environment

Fatigue property of RPV steel is one of the most key parameters in the RPV design life evaluation. The fatigue tests of domestic A5083 steel under the simulated AP1000 primary coolant environment were carried out, the fatigue data of 0.04%/s strain rate, 321 ℃, 15.5 MPa and 0.1 ppm dissolved oxygen were obtained. The results show that the peak stress increases as the strain amplitude. During the fatigue test, the specimens show three stages: Cyclic hardening, cyclic softening and saturation. Fatigue life decreases from 105 to 102, as the strain amplitude increases from 0.2% to 0.6%. The fatigue fracture surface morphology has the characteristics of fatigue and corrosion, which indicates the typical corrosion fatigue fracture.