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Increased relative density and characteristic melt pool Signals at the edge in PBF-LB/M

  • Limited process control can cause metallurgical defect formation and inhomogeneous relative density in laser powder bed fusion manufactured parts. This study shows that process monitoring, based on optical melt-pool signal analysis is capable of tracing relative density variations: Unsupervised machine learning, applied to cluster multiple-slice monitoring data, reveals characteristic patterns in this noisy time-series signal, which can be co-registered with geometrical positions in the build part. For cylindrical 15–5 PH stainless steel specimens, manufactured under constant process parameters and post-analyzed by µ-computer tomography, correlations between such patterns and an increased local relative density at the edge have been observed. Finite element method (FEM) modeling of thermal histories at exemplary positions close to the edge suggest pre-heating effects caused by neighboring laser scan trajectories as possible reasons for the increased melt pool intensity at the edge.

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Author:Jorrit Voigt, Thomas Bock, Uwe Hilpert, Ralf HellmannORCiD, Michael Moeckel
URL:https://www.sciencedirect.com/science/article/pii/S2214860422001993?via%3Dihub
DOI:https://doi.org/https://doi.org/10.1016/j.addma.2022.102798
Parent Title (English):Additive Manufacturing
Document Type:Article
Language:English
Year of Completion:2022
Release Date:2024/01/23
GND Keyword:Maschinelles Lernen; Schmelze
Volume:2022
Issue:57/102798
First Page:*
Last Page:*
Urheberrecht:1
Institutes:Fakultät Ingenieurwissenschaften / Labore / Medizinische IT & Simulation
research focus :Intelligent Systems / Artifical Intelligence and Data Science
Reviewed:ja
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International
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