About this Abstract |
| Meeting |
2026 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2026)
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| Symposium
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2026 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2026)
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| Presentation Title |
Melt Pool Behavior, Microstructure and Mechanical Properties of Modulated Laser Powder Bed Fusion Processed Ti6Al4V |
| Author(s) |
Sivaji Karna, Sun Can, Venkata Satya Surya Amaranth Karra, Lang Yuan, Hector R. Siller |
| On-Site Speaker (Planned) |
Sivaji Karna |
| Abstract Scope |
In powder bed fusion-laser beam/metal (PBF-LB/M) processing, microstructure control is critical for tailoring mechanical properties and improving component performance. This study investigates the effect of scan speed on melt pool 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, duty cycle, effective heat input was controlled, enabling transition from keyhole to conduction-mode melting. Cubic samples with high density (>99.9%) were obtained with optimized process parameters. Electron backscatter diffraction analysis revealed that laser modulation reduced the columnar prior β grain width compared with CW laser processing and promoted preferential α variant formation. Tensile testing was performed on horizontally oriented specimens, and results were correlated with the microstructure. Overall, this study demonstrates that laser modulation provides an effective strategy for controlling the microstructure of PBF-LB/M printed Ti6Al4V without altering alloy chemistry. |
| Proceedings Inclusion? |
Undecided |