| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture: Towards Accurate Prediction
|
| Presentation Title |
Tailoring the Microstructure to Improve the Fatigue Performance of Ti-6Al-4V Manufactured with Laser Powder Bed Fusion |
| Author(s) |
Mo-Rigen He, Anchen Tong, Laura Dial, Marissa Brennan, Victor Ostroverkhov, Christopher Immer, Kevin Hemker |
| On-Site Speaker (Planned) |
Anchen Tong |
| Abstract Scope |
The heterogeneous microstructures of additively manufactured alloys can have profound influence on their fatigue behavior. In a Ti-6Al-4V alloy with lamellar α+β microstructure, it has been elucidated that the initiation of low-cycle fatigue damage is governed by the prismatic dislocation slip in α laths and has a strong correlation with the crystal orientation of prior β grains relative to the tensile load. In this study, we show that laser powder bed fusion manufacturing of Ti-6Al-4V is remarkably improved by modulating the laser path with a fast-scanning mirror system developed by GE Aerospace Research. The wobbling laser is found to enhance the cube texture of prior β grains and lead to drastic anisotropy in damage resistance and fatigue life of the samples as tested with four-point micro-bending. These results open a new avenue for tailoring microstructure and improving fatigue performance with rational control of processing and service conditions of the builds. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Titanium, Characterization |