OS0732 Development of elevated temperature structural design method for fast reactor vessels : Part 4: Effect of ratcheting strain on 316FR creep-fatigue strength

Abstract

The effect of ratcheting strain on creep-fatigue strength was investigated in order to adjust the strain limit. Ratcheting creep-fatigue tests were conducted at 600℃ with lhr hold time. Creep fatigue lives did not decrease when the accumulated strain was superimposed within 5%. Therefore the effect of ratcheting on creep-fatigue strength is negligible when accumulated strain exceeds 2%.