Kupfer T, Breuning C, Markl M (2024)
Publication Type: Journal article
Publication year: 2024
Book Volume: 91
Article Number: 104321
DOI: 10.1016/j.addma.2024.104321
Powder bed fusion processes are currently used to manufacture parts with high geometric complexity. However, achieving defect-free complex geometries with homogeneous properties using classic line-based melting strategies remains challenging. Electron beam powder bed fusion offers a promising solution through spot melting, which involves jumping from one melt spot to another at a very high velocity. The key concept is that homogeneous properties can be attained if all melt spots are thermally independent of each other. The corresponding sequence of these melt spots controls the temperature field, thereby influencing the microstructure and mechanical properties. The main challenge is to develop a spot-melting sequence that ensures thermal independence of the spots while adhering to other process constraints, such as machine-dependent jump lengths. In this study, we developed a new heuristic algorithm to generate a spot-melting sequence. This method is based on the subdivision of complex geometries into consecutive melted groups. The groups were transformed into graphs connecting the spots inside the groups with all possible jumps that met certain machine restrictions. A heuristic algorithm, adapted to identify the Hamiltonian paths, determines the final spot-melting sequence. We demonstrated the applicability of the heuristic algorithm to complex geometries using single layer of a fuel nozzle combined with temperature simulations.
APA:
Kupfer, T., Breuning, C., & Markl, M. (2024). Graph-based spot melting sequence for electron beam powder bed fusion. Additive Manufacturing, 91. https://doi.org/10.1016/j.addma.2024.104321
MLA:
Kupfer, Tobias, Christoph Breuning, and Matthias Markl. "Graph-based spot melting sequence for electron beam powder bed fusion." Additive Manufacturing 91 (2024).
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