| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Recent Advances in Titanium Science and Technology: MPMD/SMD Symposium Honoring Professor Dipankar Banerjee
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| Presentation Title |
Microstructural control of prior-beta grain orientation dramatically increases the fatigue resistance of DMLM Ti-6Al-4V |
| Author(s) |
Anchen Tong, Mo-Rigen He, Laura Dial, Marissa Brennan, Victor Ostroverkhov, Christopher Immer, Kevin J. Hemker |
| On-Site Speaker (Planned) |
Kevin J. Hemker |
| Abstract Scope |
During cyclical loading of Ti-6Al-4V, crack nucleation and short crack growth is tightly coupled to the lamellar alpha + beta microstructure. Coupled micro-bending and EBSD studies of DMLM Ti-6Al-4V have elucidated that fatigue damage is initiated by prismatic slip in alpha laths and is strongly correlated with the crystallographic orientation of prior-beta grains relative to the applied stress. With this in mind, we will show that GE’s ability to modulate and wobble the laser path with a fast scanning mirror enhances the cube texture of prior-beta grains without deteriorating the microstructure. The strongly textured samples then exhibit dramatic anisotropy in fatigue resistance. Fatigue crack nucleation in easiest when the applied stress is aligned along <001> but little to no damage is observed when the sample is loaded parallel to <111>. These results suggest an exciting new possibility for improving fatigue performance, with judicious control of processing conditions and attendant microstructures. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Titanium, Additive Manufacturing, Mechanical Properties |