Introduction to an approach based on the (α+β) microstructure of elements of alloy Ti-6Al-4V

The goal of linking a fatigue life approach with different forging processes enforces the consideration of the main process dependent influence factors, e.g. effective strain, effective strain rate, anisotropy and morphology, alpha-grain size, alphacontiguity, distance between secondary alpha and beta-lamellae, etc. Linking the specimen lifetime results to these microstructural features, new design parameters for forged titanium parts can be identified. These forecasting parameters can than be used at design stage to optimise the (α+β)-titanium alloy forgings with regard to lifetime.