Effect of microstructure on low cycle fatigue properties of ODS steels

Low cycle fatigue properties at room temperature, 650 °C and 750 °C of three high chromium steels (9%Cr ferritic–martensitic and two 14%Cr ferritic steels) strengthened by oxide dispersion were studied and compared. Cyclic softening/hardening curves, cyclic deformation curves, S–N curves and Coffin–Manson curves are presented together with microstructural observations. Differences in cyclic response, stress level and fatigue life are attributed...