| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture: Towards Rapid Qualification
|
| Presentation Title |
An Exploration of Process Parameters and Process-induced Defects in LPBF Ti-6Al-4V via Fatigue and Fracture Characterization |
| Author(s) |
Austin Q. Ngo, David Scannapieco, Francisco Medina, Christian Gobert, Anthony Rollett, Jack Beuth, John J. Lewandowski |
| On-Site Speaker (Planned) |
Austin Q. Ngo |
| Abstract Scope |
Test specimens of LPBF Ti-6Al-4V were fabricated with both optimized and sub-optimal process parameters to explore the influence of process-induced defects on mechanical and fatigue properties. S-N fatigue and tensile test data were generated across a range of process parameters, and specimen fracture surfaces were imaged using OM and SEM. Fractographic analyses consisted of quantifying all defects on the fracture surface and identifying ‘killer’ defects responsible for fatigue crack initiation. Different types of process-induced defects (i.e. lack of fusion, keyhole) were found to be more prevalent based on particular process parameter sets, which further influenced properties. Specimen surface roughness was also examined and found to influence fatigue crack initiation behavior. The effects of process parameters on defect characteristics and the resulting S-N fatigue and tensile strength behavior will be discussed in the context of a defect-based Kitagawa-Murakami-type modeling approach. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Mechanical Properties, Titanium |