Synergistic effect of mechanical and environmental damages of 316LN stainless steel under different fatigue strain amplitudes in high-temperature pressurized water

Corrosion fatigue (CF) behavior of 316LN stainless steel under different strain amplitudes (0.3-0.8%) in 325 degrees C water was investigated at a strain rate of 0.04% s(-1). It was found that the fatigue life and strain amplitude has a linear relation in double logarithmic coordinate. The environmental damage increased with decreasing strain amplitudes. The synergistic effect of mechanical and environmental damages during the CF process in high. temperature pressurized water is discussed, and a calculation equation for environmental fatigue correction factor F-en is proposed to calculate the strain amplitude effect.