| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Equipment, Instrumentation and In-Situ Process Monitoring
|
| Presentation Title |
Electron Optical Imaging: A Versatile Process Monitoring Tool in Electron Beam Powder Bed Fusion |
| Author(s) |
Jakob Renner, Matthias Markl, Carolin Körner |
| On-Site Speaker (Planned) |
Jakob Renner |
| Abstract Scope |
Electron Optical (ELO) imaging is the process monitoring method of choice in Electron Beam Powder Bed Fusion. The build surface is imaged with a focused, low-power electron beam by scanning the build surface line-by-line. Suitable detector systems collect back scattered electrons and allow to map the recorded voltage signals to 2D images. Single-detector systems are used to resolve local surface porosity, for process parameter and scan strategy development, dimensional accuracy measurements and enable the creation of accurate digital twins. In-situ determination of the build surface topography is demonstrated using multi-detector ELO systems. Quantities like the local powder height can be computed by combining the topography of a freshly applied powder layer with the melt surface topography of the previous layer. This talk gives a detailed overview over the principles of ELO imaging and emphasizes the practical applications in all process phases with an active electron gun. |