| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
Physics and Comparison of Complex Melt Flow and Defect Formation During Pulsed and Continuous Selective Laser Melting |
| Author(s) |
Ian Mccue, Steven Storck, Morgan Trexler |
| On-Site Speaker (Planned) |
Ian Mccue |
| Abstract Scope |
Laser powder bed fusion additive manufacturing is a rapidly growing technology to produce components with unique and complex geometries. However, a major obstacle to its wide-spread use is defect formation during fabrication. High energy densities, fast laser-scan speeds, and rapid cooling can introduce a variety of defects, such as lack-of-fusion and keyhole porosity. It is experimentally challenging to capture defect formation, but significant insights have been garnered using continuum modeling techniques. Here, we use a high fidelity fluid dynamics model – that uses laser ray tracing, recoil pressure, surface tension, and evaporative cooling – to compare and contrast melt pool dynamics during continuous and pulsed selective laser melting. We find that continuous laser scanning produces elongated melt tracks that are susceptible to instabilities within a given melt layer, whereas pulsed laser scanning produces deep melt tracks that are susceptible to defects forming in previously melted layers. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |