About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing: Materials Design and Alloy Development II
|
Presentation Title |
A-69: Origin and How to Reduce Splatter in Powder Bed Fusion |
Author(s) |
Hans-Wilfried Mindt, Mustafa Megahed |
On-Site Speaker (Planned) |
Mustafa Megahed |
Abstract Scope |
Process parameters usually used in powder bed fusion additive manufacturing (PBF) lead to evaporation and a recoil pressure that interacts with powder and molten metal. As a result, splatter particles are ejected from the vicinity of the melt pool. In some cases; especially if the splatter particles are large, the shield gas cannot carry ejected particles out of the processing chamber. They land downstream of shield gas flow on the powder bed leading to process defects due to their mass. Splatter also affects the recyclability of unused powder negatively leading to an overall increase in PBF cost. In this numerical study the origin of splatter is studied by deactivating different terms of the conservation equations. The unprocessed powder is assumed static. Only material ejected from the melt pool is studied. Once the splatter origins are identified, possibilities of reducing splatter by adapting process parameters or alloying elements is explored. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |