| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Computational Techniques for Multi-Scale Modeling in Advanced Manufacturing
|
| Presentation Title |
Microstructural Evolution and Defect Formation During Pulsed and Continuous Selective Laser Melting |
| Author(s) |
Ian Mccue, Steven Storck, James Mastandrea, Morgana Trexler |
| On-Site Speaker (Planned) |
Ian Mccue |
| Abstract Scope |
Laser powder bed fusion additive manufacturing (AM) is a growing technology to produce unique components with complex geometries. However, an obstacle to its wide-spread use is understanding defect formation and microstructural evolution during AM. High energy densities, fast laser-scan speeds, and rapid cooling introduce a variety of defects and grain morphologies within a single melt pool. It is experimentally challenging to capture and assess these details, but insights have been garnered from continuum modeling techniques. Here, we use a high fidelity fluid dynamics model (CFD) – that includes laser ray tracing, recoil pressure, surface tension, and evaporative cooling – to compare and contrast melt pool dynamics during continuous and pulsed selective laser melting. Using a customized post-processing tool and statistical methods, we find that pulsed lasers systems produce higher pore fractions than continuous lasers, with a much smaller “fully dense” regime, but lead to smaller G/R values and refined microstructures. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Computational Materials Science & Engineering, Modeling and Simulation |