|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Fatigue and Fracture
||Fatigue Characteristics of Additively Manufactured Aerospace Materials
||Brad Lerch, David Ellis, Susan Draper, Chantal Sudbrack
|On-Site Speaker (Planned)
This presentation documents the fatigue properties of three additive manufactured (AM) metallic systems (Ti-6-4, GRC op-84, and Alloy 718) used by NASA in various aerospace applications. These alloys were produced using the powder bed method, with the titanium alloy using an electron beam melting (EBM) and the other two alloys using selective laser melting systems (SLM). For each material a large matrix of fatigue tests were conducted and the fatigue characteristics compared to their conventionally manufactured counterparts. Build orientations and resulting microstructures are discussed with respect to the tested mechanical properties. Detailed analyses of the fatigue crack initiation sites are presented which include the influence of the as-manufactured surface as well as the presence of inclusions, porosity, and unmelted powder particles. While the AM-generated defects are influential in initiating cracks, they often do not result in degraded lives.
||Planned: Supplemental Proceedings volume