| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
Synchrotron Validated Simulations of Pore Formation During Laser Powder Bed Fusion of Nickel Superalloys |
| Author(s) |
Chu Lun Alex Leung, Dawid Luczyniec, Enyu Guo, Sebastian Marussi, Robert C Atwood, Benjamin C Saunders, Peter D Lee |
| On-Site Speaker (Planned) |
Chu Lun Alex Leung |
| Abstract Scope |
The defect evolution mechanisms in powder bed fusion (PBF) additive manufacturing remains unclear owing to the fast laser-material interaction. Here, we reveal defect dynamics inside single-layer Inconel 625 melt tracks during PBF using high-speed synchrotron X-ray radiography (SXR). All melt tracks were post-examined by X-ray computed tomography (XCT). We applied advanced image quantification techniques to extract real-time defect statistics from the SXR data and deduced the melt volume and defect population in 3D from the XCT data. Experimental results were used to inform a 3D multiphase fluid flow simulation, resolving thermophysical phenomena at the solid-liquid-gas interface, from powder melting to material evaporation at high-resolution. The simulation results uncover distinctive melt flow and defect dynamics as well as their influence on track morphology under different build conditions. This study demonstrates that the combination of multiphase model and X-ray imaging can help understand and control the processing effects on microstructure. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |