| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture: Towards Accurate Prediction
|
| Presentation Title |
Competition Between Defects and Microstructure on Fatigue Crack Formation and Life in L-PBF IN718 |
| Author(s) |
Alexander Caputo, Richard William Neu |
| On-Site Speaker (Planned) |
Richard William Neu |
| Abstract Scope |
In components undergoing cyclic loading, fatigue cracks form at the weakest location within the microstructure. When defects such as lack-of-fusion features and keyhole porosity are present at highly stressed locations, these are often the sites where the fatigue cracks form. However, in optimally processed alloys, these defects are minimal in size. Then fatigue crack formation is driven by other microstructure features, such as the grain size, morphology, and crystallographic texture. Both the defects and microstructure are highly dependent on the additive manufacturing (AM) process conditions and therefore both need to be considered in microstructure-based lifing methods. This experimental study, involving over 100 high cycle fatigue (HCF) tests conducted at 538°C on L-PBF IN718, explores the role of different defect types and microstructures on the HCF crack formation mechanisms and cycles to failure. It provides support for developing microstructure-based fatigue lifing models for AM. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Other |