Cyclic plasticity and damage mechanisms of Ti-6Al-4V processed by electron beam melting

Cyclic deformation and damage mechanisms in electron-beam-melted Ti-6Al-4V are investigated. As-built samples exhibit a graded microstructure over the height of 120 mm, with from top having larger α-laths higher plastic strain. After HIPing, α-lath width is greater, reduced grain misorientation, lower microstructural property gradients. In both conditions, observed cyclic softening dominated by monotonic reduction friction stress an increase suggesting lath structure progressively fragments into smaller grains. show typically fatigue life due to crack initiation gas pores lack-of-fusion defects.