Damage mechanism and life prediction based on tensile-stress- and compressive-stress-dominated low-cycle fatigue of a directionally solidified Ni-based superalloy DZ445

Based on the tensile stress-dominated (strain ratio,R=εmin/εmax=0) and compressive stress-dominated (R = ∞) low-cycle fatigue (LCF) of a first-generation directionally solidified Ni-based superalloy DZ445 at 900 °C, the paper investigated the contribution of tensile stress and compressive stress to the damage during LCF and creep-fatigue deformation. The results demonstrated that the fatigue life in the case of tensile stress-dominated LCF is...