Abstract
AbstractLow‐cycle‐fatigue texts in vacuum and air were performed. Under cyclic loading the Ti‐6Al‐4V showed both cyclic hardening and cyclic softening depending on heat treatment, stress amplitude, and microstructure. Plastic deformation of the β‐phase in the unaged condition due to stress induced martensitic transformation caused cyclic hardening. Cyclic softening was observed if the α‐phase hardened by coherent Ti3Al particles was plastically deformed.Equiaxed microstructures exhibited a stronger cyclic softening than lamellar structures. This behavior could be explained by the pronounced texture of the equiaxed microstructures, whereas the lamellar structures were texture‐free.The fatigue life was influenced by the cyclic softening process mainly in the low‐cycle‐fatigue regime. The fatigue life at normalized stress amplitude (σa/σy) was shorter for microstructures with strong cyclic softening as compared to microstructures with lower cyclic softening.
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