Adjusting the microstructure of additively manufactured parts with tailored temperature fields by the combination of powder bed fusion with cw-laser and ablation with ultrashort laser pulses

Johannes Michel; Nico Ulff; Manuel Henn; Brian Simonds; Peter Hosemann; Frederik Zanger; Christian Hagenlocher; Thomas Graf

doi:10.1117/12.3002302

12 March 2024 Adjusting the microstructure of additively manufactured parts with tailored temperature fields by the combination of powder bed fusion with cw-laser and ablation with ultrashort laser pulses

Johannes Michel, Nico Ulff, Manuel Henn, Brian Simonds, Peter Hosemann, Frederik Zanger, Christian Hagenlocher, Thomas Graf

Author Affiliations +

Proceedings Volume 12876, Laser 3D Manufacturing XI; 1287609 (2024) https://doi.org/10.1117/12.3002302
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

In powder bed fusion with laser beams (PBF-LB/M), the component's quality and mechanical properties are limited by restricted process parameter combinations and the geometry of the component. Combining PBF-LB/M with ultrashort laser ablation enables additional control of the heat flow to adjust local solidification. On the one hand it is possible to print heat-dissipating structures, which can be added and removed during the build process. On the other hand, ablated slits in the component can serve as a thermal barrier. To investigate the effect of slits and heat-dissipation structures on the local temperature field and solidification conditions, a numerical model was developed. Two different ablation strategies were investigated and compared to conventional PBF-LB. Numerical investigations of an additively manufactured AlSi10Mg component showed a larger melt pool, a lower temperature gradient, and a lower cooling rate if there are slits present next to the current PBF-LB track. This approach provides the potential to independently adjust microstructure and mechanical properties, exceeding limitations imposed by the component's geometry in conventional additive manufacturing.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Johannes Michel, Nico Ulff, Manuel Henn, Brian Simonds, Peter Hosemann, Frederik Zanger, Christian Hagenlocher, and Thomas Graf "Adjusting the microstructure of additively manufactured parts with tailored temperature fields by the combination of powder bed fusion with cw-laser and ablation with ultrashort laser pulses", Proc. SPIE 12876, Laser 3D Manufacturing XI, 1287609 (12 March 2024); https://doi.org/10.1117/12.3002302

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