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2023Subject
600 Technology Selektives ElektronenstrahlschmelzenInconel 718MikrostrukturGefüge <Werkstoffkunde>Rapid Prototyping <Fertigung>Metadata
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Aufsatz
Beam powder bed fusion for direct microstructure design – In-depth analysis of prospects and limitations of the multi spot scanning strategy
Abstract
The electron beam powder bed fusion process generally results in a strong 〈001〉 texture alongside the build direction for Inconel 718. This is a result of prevailing high thermal gradients between the melted surface and the solid material. However, based on specific beam movement patterns, the solidification behaviour can be altered towards an equiaxed, isotropic microstructure. The present study focuses on the “multi spot scanning” strategy directly provided by the machine manufacturer. The operation mode of the multi spot scanning strategy of an Arcam A2X was investigated in depth by means of high-speed imaging of the beam movement pattern and direct correlation to the process parameters considered. As a hypothesis, it was thought that this strategy is effective for direct microstructure design as well. Results indicate that a target-oriented adaption of the scanning strategy in different part cross-sections is feasible. Microstructural investigations including scanning electron and optical microscopy revealed that the multi spot scanning strategy generally allows establishing a fine-grained, isotropic microstructure. However, if the scanning strategy parameters are not adapted to the part cross-section, a randomized electron beam movement pattern can occur, which negatively affects the microstructural evolution and relative density of the processed material.
Citation
In: Journal of Manufacturing Processes Volume 108 (2023) , S. 485-497 ; eissn:2212-4616Additional Information
© This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/Citation
@article{doi:10.17170/kobra-202403149772,
author={Arold, Tizian and Suckau, Andreas and Böhm, Stefan and Krooß, Philipp and Niendorf, Thomas},
title={Beam powder bed fusion for direct microstructure design – In-depth analysis of prospects and limitations of the multi spot scanning strategy},
journal={Journal of Manufacturing Processes},
year={2023}
}
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2024-04-05T13:49:08Z 2023 doi:10.17170/kobra-202403149772 http://hdl.handle.net/123456789/15621 © This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/ eng Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ PBF-EB/M Inconel 718 microstructure design grain structure additive manufacturing scanning strategy 600 Beam powder bed fusion for direct microstructure design – In-depth analysis of prospects and limitations of the multi spot scanning strategy Aufsatz The electron beam powder bed fusion process generally results in a strong 〈001〉 texture alongside the build direction for Inconel 718. This is a result of prevailing high thermal gradients between the melted surface and the solid material. However, based on specific beam movement patterns, the solidification behaviour can be altered towards an equiaxed, isotropic microstructure. The present study focuses on the “multi spot scanning” strategy directly provided by the machine manufacturer. The operation mode of the multi spot scanning strategy of an Arcam A2X was investigated in depth by means of high-speed imaging of the beam movement pattern and direct correlation to the process parameters considered. As a hypothesis, it was thought that this strategy is effective for direct microstructure design as well. Results indicate that a target-oriented adaption of the scanning strategy in different part cross-sections is feasible. Microstructural investigations including scanning electron and optical microscopy revealed that the multi spot scanning strategy generally allows establishing a fine-grained, isotropic microstructure. However, if the scanning strategy parameters are not adapted to the part cross-section, a randomized electron beam movement pattern can occur, which negatively affects the microstructural evolution and relative density of the processed material. restricted access Arold, Tizian Suckau, Andreas Böhm, Stefan Krooß, Philipp Niendorf, Thomas doi:10.1016/j.jmapro.2023.10.070 Selektives Elektronenstrahlschmelzen Inconel 718 Mikrostruktur Gefüge <Werkstoffkunde> Rapid Prototyping <Fertigung> acceptedVersion eissn:2212-4616 Journal of Manufacturing Processes 485-497 Volume 108 2025-12-22 2025-12-22 false
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