High-cycle fatigue behavior of a laser powder bed fusion additive manufactured Ti-6Al-4V titanium: Effect of pores and tested volume size

This work is focused on the effect of natural defect fatigue resistance a laser powder bed fusion additively manufactured Ti-6Al-4V titanium. To reveal strength variability and its sensitivity to size, push-pull tests have been undertaken specimens with different sizes highly loaded volume material. In order easily vary size volume, containing numbers surface hemispherical shape holes 600 ?m in diameter tested. method also allowed test small which triggered crack initiation from microstructural features. The damage mechanisms observed average measured failure surfaces depend stressed region. A higher for smaller volumes free regions. reduce impact lack-of-fusion increase probability triggering feature, were built horizontal direction. For where cracks initiated at discontinuities, results reported Kitagawa-Takahashi diagram revealed critical (area) range 30 ?m. addition, probabilistic approach based weakest link theory proposed. model describes accounting both defect.