About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Phase Stability, Phase Transformations, and Reactive Phase Formation in Electronic Materials XXV
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| Presentation Title |
Martensitic α' Lath Width Effect on Fracture Elongation in EBW of Ti-6Al-4V Wrought-to-Additive Manufacturing Dissimilar Joints |
| Author(s) |
Cheng-Chang Hsieh, Dong-Yu Wu, Ching-Yuan Luo, Kuo-Kuang Jen, Yi-Cherng Feng, Jhe-Yu Lin |
| On-Site Speaker (Planned) |
Cheng-Chang Hsieh |
| Abstract Scope |
This study examines the impact of heat input on the microstructure and mechanical properties in electron beam welding (EBW) of dissimilar Ti-6Al-4V joints between wrought and additively manufactured (AM) parts. The results demonstrate that fracture behavior and ductility are primarily controlled by the size of the martensitic α' phase within the fusion zone (FZ). Specimens welded with moderate energy density achieved elongations exceeding 10% and mostly fractured in the AM part, which contained coarse acicular α and intergranular β phases. In the FZ, these specimens exhibited relatively finer α' martensitic laths (1-5 μm width). Conversely, specimens welded with high energy density showed reduced elongation (<10%) and failed predominantly within the FZ, characterized by coarse martensitic α' laths, with a width larger than 5 μm. Future research will focus on incorporating beam oscillation frequency and width into energy density calculations to predict the effects of heat input on joint properties. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Joining, Titanium |