About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture
|
| Presentation Title |
Defect and Local Microstructure Effects on Fatigue Behavior in LPBF Ti-6Al-4V: Insights from Fractographic Analysis |
| Author(s) |
Brett E. Ley, Austin Ngo, Oluwatumininu Adeeko, Katie O'Donnell, Anthony Rollett, Sierra Green, Bryan Webler, Justin Miner, Sneha Narra, John J. Lewandowski |
| On-Site Speaker (Planned) |
Brett E. Ley |
| Abstract Scope |
In a prior study, four-point bend (4PB) and axial fatigue specimens of LPBF Ti-6Al-4V were fabricated using both optimized and sub-optimal process parameters to investigate the influence of process-induced defects on fatigue performance. Specimens were tested to failure under cyclic loading, and fractography was performed using scanning electron microscopy (SEM) to quantify fracture-surface defects and identify the ‘killer’ defect(s) responsible for crack initiation. A key observation was that specimens with nominally identical processing conditions and initiating defect characteristics exhibited fatigue lives differing by more than an order of magnitude (>10×). This finding suggests that fatigue performance depends not only on the initiating defect but also on the local microstructural ‘neighborhood’ surrounding that defect. The microstructural impacts on fatigue are further investigated through testing notched and unnotched specimens printed within the nominal process window and subjected to heat treatment, hot isostatic pressing (HIP), or both. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Titanium, Mechanical Properties |