|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Building the Pathway towards Process and Material Qualification
||Empirical Approach to Understanding the Fatigue Behavior of Metals Made Using Additive Manufacturing
||David Witkin, Thomas Albright, Dhruv Patel
|On-Site Speaker (Planned)
High-cycle fatigue properties of Inconel 625 made by selective laser melting and Ti-6Al-4V made by electron beam melting were measured for specimens built in the vertical direction. Tests were run at stress ratios of R = -1.0, 0.1 and 0.5. The resulting S-N curves were compared to established design guidelines for these alloys in MIL-HDBK-5, and the fatigue behavior of the additive manufactured materials was similar to annealed properties of notched wrought material. Even though the notch is a macroscopic feature of the test bar, the surface roughness of the AM materials can be approximated by geometric characteristics that lead to a stress concentration factor that explains the similarity between the experimental S-N curves and published S-N behavior for wrought material with Kt from 2.5 to 3.0. These results provide an empirical basis for estimating the fatigue behavior of AM-built parts subjected to dynamic loading conditions.
||Planned: A print-only volume