About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Equipment, Instrumentation and In-Situ Process Monitoring
|
| Presentation Title |
Thermal Imaging with Off-The-Shelf Color Cameras Yields New Insights to Melt Pool Physics in AM Processes |
| Author(s) |
Jonathan Malen |
| On-Site Speaker (Planned) |
Jonathan Malen |
| Abstract Scope |
Thermal imaging is a powerful tool for process monitoring of AM processes because it provides direct insight to cooling mechanisms and solidification rates. We demonstrate an experimental technique to image melt pool temperature with a commercial color camera on laser powered bed fusion, powder-blown laser directed energy deposition, and wire arc additive manufacturing. This technique relies on two-color thermography and high dynamic range photography to construct spatially-resolved thermal fields of melt pools from solidus to vaporization. Comparison of in-situ temperature measurements and ex-situ cross-sectional geometry to multi-physics computational fluid dynamics models (FLOW-3D and OpenFOAM) provides a means of calibrating uncharacterized parameters, such as evaporative accommodation coefficients and the temperature-dependence of surface tension in various metals (316L SS, Ti64, Inconel 718). Thermal images yield solidification rates in melt pool tails that can be correlated with ex-situ observations of microstructure. |