Cyclic Deformation Behavior of SA508 Gr.1a Low Alloy Steel under Low Cycle Fatigue Loading in $310^{\circ}C$ Low Oxygen-Contained Water

(1) SA508 Gr.1a LAS exhibited a moderate cyclic hardening in $310^{\circ}C$ low DO water. A saturation stage or a slightly secondary hardening was occurred with decreasing strain amplitude. (2) Fatigue life of SA508 Gr.1a LAS decreases a little with decreasing strain rate in $310^{\circ}C$ low DO water.