Low Cycle Fatigue Behaviors of Structural Steel 16Cr3NiWMoVNbE at Different Temperatures

The total strain-controlled low cycle fatigue(LCF) tests at strain ratio of -1 were performed on a structural steel 16Cr3NiWMoVNbE at 25, 100, 200, 300, 350 ℃. The cyclic stress response, fatigue life and cyclic stress-strain behaviors of 16Cr3NiWMoVNbE steel at different temperatures were investigated. The results indicate that the steel represented cyclic softening at the temperature no higher than 200 ℃ and cyclic hardening while the temperature was 300 ℃. When the temperature rose, the fatigue life shortened. The relationship between strain and life can be described well by three-parameter power function at different temperatures.