Document Type
Article
Publication Date
5-26-2021
Department
Department of Manufacturing and Mechanical Engineering Technology
Abstract
Recoil pressure is a critical factor affecting the melt pool dynamics during Laser Powder Bed Fusion (LPBF) processes. Recoil pressure depresses the melt pool. When the recoil pressure is low, thermal conduction and capillary forces may be inadequate to provide proper fusion between layers. However, excessive recoil pressure can produce a keyhole inside the melt pool, which is associated with gas porosity. Direct recoil pressure measurements are challenging because it is localized over an area proportionate to the laser spot size producing a force in the mN range. This paper reports a vibration-based approach to quantify the recoil force exerted on a part in a commercial LPBF machine. The measured recoil force is consistent with estimates from high speed synchrotron imaging of entrained particles, and the results show that the recoil force scales with applied laser power and is inversely related to the laser scan speed. These results facilitate further studies of melt pool dynamics and have the potential to aid process development for new materials.
Publication Title
Scientific Reports
Recommended Citation
Cullom, T.,
Lough, C.,
Altese, N.,
Bristow, D.,
Landers, R.,
Brown, B.,
Hartwig, T.,
Barnard, A.,
Blough, J.,
Johnson, K.,
&
Kinzel, E.
(2021).
Frequency domain measurements of melt pool recoil force using modal analysis.
Scientific Reports,
11(1).
http://doi.org/10.1038/s41598-021-90423-z
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/14977
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Version
Publisher's PDF
Publisher's Statement
© The Author(s) 2021. Publisher’s version of record: https://doi.org/10.1038/s41598-021-90423-z