About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
2026 Technical Division Student Poster Contest
|
| Presentation Title |
SPG-81: Effect of Laser Modulation on Melt Pool Behavior and Microstructure in LPBF Ti-6Al-4V |
| Author(s) |
Sivaji Karna, Sun Can, Lang Yuan, Hector R. Siller |
| On-Site Speaker (Planned) |
Sivaji Karna |
| Abstract Scope |
Ti-6Al-4V is a widely used α+β titanium alloy in aerospace applications due to its high strength-to-weight ratio and excellent corrosion resistance. This study investigates the effect of scan speed on single-track formation under continuous-wave (CW) and laser-modulated processing conditions. At lower scan speeds, CW processing resulted in keyhole-mode melt pool behavior. By adjusting laser modulation parameters, particularly frequency and duty cycle, the effective heat input was controlled, enabling a transition from keyhole to conduction-mode melting. Single-track experiments were performed on wrought substrates and on the top surface of additively manufactured cubes to better represent realistic processing conditions, with similar melt pool trends observed in both cases. Microstructural analysis revealed refinement of prior β grains under laser-modulated conditions compared to CW processing. Simulated thermal histories were correlated with experimental observations, highlighting process parameter strategies for improving melt pool stability and achieving high-density Ti-6Al-4V components. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Additive Manufacturing, Other, Other |