| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture IV: Toward Confident Use in Critical Applications
|
| Presentation Title |
Relating Additive Manufacturing Processing Conditions to Surface Roughness, Porosity and Microstructure Influencing Fatigue Life |
| Author(s) |
Joy Gockel, Luke Sheridan, Eric Tatman, Dino Celli, Wesley Eidt |
| On-Site Speaker (Planned) |
Joy Gockel |
| Abstract Scope |
Additive manufacturing (AM) is unique because the material is being built at the same time as the component. Process condition variations in specific geometric sections of the component result in material variations. The relationships of processing conditions to surface roughness, porosity, microstructure and fatigue performance are investigated for alloy 718 fabricated using laser powder bed fusion AM. Both standard fatigue test bars and custom geometries with structurally relevant as-built features are utilized. Material characterization using traditional, experimental methods requires numerous specialized tests under various conditions, but the cost of manufacturing and preparing the AM test specimens (time, material, post-processing, etc.), often makes high volume testing infeasible. A novel method is applied to analyze a single axial fatigue test to provide information for crack initiation and growth behavior. Understanding the component-specific crack growth data provides insight for identifying microstructure causing structural performance variation in AM components. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |