Effect of microstructural characteristics on the low cycle fatigue behaviors of cast Ni-base superalloys

Low cycle fatigue behaviors of two cast Ni-base superalloys have been investigated. Effects of microstructure of a solution hardened alloy and a precipitation strengthened alloy on cyclic stress responses were studied at various temperatures and strain ranges. In the case of a solution hardened alloy, Hastelloy X, fatigue lives at lower temperatures are longer than those at higher temperatures regardless of total strain range. IN738LC which is...