On dual-slope linear cyclic hardening of Hastelloy X

In low cycle fatigue deformation of Hastelloy X, a unique dual-slope linear cyclic hardening is observed, with transition region in between, followed by non-linear hardening till failure. Though both temperature and accumulated strain can enhance the carbide precipitation, interestingly it is observed that transition region is found to be more sensitive to change in applied strain amplitude rather than changes in temperature.