| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture: Towards Accurate Prediction
|
| Presentation Title |
Elevated Temperature Low Cycle Fatigue Life of Hastelloy X Fabricated Via Laser Powder Bed Fusion |
| Author(s) |
Ritam Pal, Brandon Kemerling, Daniel Ryan, Sudhakar Bollapragada, Amrita Basak |
| On-Site Speaker (Planned) |
Amrita Basak |
| Abstract Scope |
Understanding high-temperature fatigue properties in low cycle regime is crucial for qualifying laser powder bed fusion (L-PBF) fabricated Hastelloy-X parts, especially in gas turbine engine applications. However, the surface roughness of L-PBF parts affects their fatigue properties. This study investigates the fatigue life of L-PBF components with heterogeneous surface roughness. Thirty-six Hastelloy X specimens are printed using L-PBF and undergo standard heat treatment. Half are tested with as-printed surfaces, while the other half are machined. Specimens are printed in vertical and 30-degree orientations. Surface roughness is measured using computed tomography, focusing on valley depth. Fatigue testing at 500 °F shows rough specimens fail sooner due to deep surface valleys acting as notches, causing high strain localization. Furthermore, a new methodology is proposed to pinpoint fatigue initiation life based on specimen compliance. This methodology is validated with fractography analysis, within 10% error. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, High-Temperature Materials, Mechanical Properties |