Cyclic plastic deformation behavior in SA333 Gr. 6 C–Mn steel

Low cycle fatigue, ratcheting and dependence of their deformation response on previous deformation histories are investigated at room temperature laboratory environment for SA333 C–Mn steel. It is noticed that cyclic hardening/softening response of low cycle fatigue is considerably influenced by applied strain amplitude, monotonic pre-straining and high to low step loading sequences. Results indicate that ratcheting under high to low step loading has significant effect on its subsequent ratcheting response. However, ratcheting under low to high step loading has very little effect on successive ratcheting responses.

► True stress controlled ratcheting response.
► LCF response.
► Effect of pre-straining on LCF and effect of pre-stressing on ratcheting response.
► High to low step loading in LCF.
► High to low and low to high step loadings in ratcheting.