Date
2024-06-17Metadata
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Aufsatz
Pathways to exploit the multi-spot scanning strategy in electron beam additive manufacturing for control of microstructure and defect density
Abstract
The goal of this study is to investigate the impact of beam deflection pattern characteristics on microstructure and porosity formation during Powder Bed Fusion Electron Beam Melting (PBF-EB/M) processing of Inconel 718. Specifically, the complex interplay between “beam return time” and “beam jump distance” and their influence on heat accumulation, porosity, and grain formation is explored. The findings reveal that beam jump distance plays a critical role in the transition from columnar to equiaxed solidification, while beam return time is essential for achieving optimal heat accumulation and minimizing porosity. By controlling these two universal beam deflection pattern characteristics, a novel multi-spot scanning strategy was developed, enabling the formation of a fine-grained equiaxed microstructure. It is demonstrated that sufficient heat accumulation is essential for a pore-free bulk material and can be achieved by short beam return times or small beam jump distances. However, for equiaxed grain formation, a large beam jump distance, i.e., a wide distribution of melt pools, is required. Therefore, heat accumulation must be controlled by means of the beam return time if equiaxed grains are aimed for. Additionally, it is found that higher beam currents are beneficial for equiaxed grain formation, but the strongest impact on the columnar to equiaxed transition is attributed to the beam movement pattern itself. This approach offers insights into microstructure control and process reliability, regardless of the specific PBF technique employed, and enables application-specific microstructure design of Inconel 718.
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Gefördert im Rahmen des Projekts DEALCitation
@article{doi:10.17170/kobra-2024083010770,
author={Arold, Tizian and Krooß, Philipp and Niendorf, Thomas},
title={Pathways to exploit the multi-spot scanning strategy in electron beam additive manufacturing for control of microstructure and defect density},
journal={Journal of Materials Research and Technology},
year={2024}
}
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3000 Arold, Tizian
3010 Krooß, Philipp
3010 Niendorf, Thomas
4000 Pathways to exploit the multi-spot scanning strategy in electron beam additive manufacturing for control of microstructure and defect density / Arold, Tizian
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5550 {{Selektives Elektronenstrahlschmelzen}}
5550 {{Inconel 718}}
5550 {{Rapid Prototyping <Fertigung>}}
5550 {{Mikrostruktur}}
5550 {{Superlegierung}}
7136 ##0##http://hdl.handle.net/123456789/16023
<resource xsi:schemaLocation="http://datacite.org/schema/kernel-2.2 http://schema.datacite.org/meta/kernel-2.2/metadata.xsd"> 2024-09-04T13:40:13Z 2024-09-04T13:40:13Z 2024-06-17 doi:10.17170/kobra-2024083010770 http://hdl.handle.net/123456789/16023 Gefördert im Rahmen des Projekts DEAL eng Namensnennung 4.0 International http://creativecommons.org/licenses/by/4.0/ PBF-EB/M Inconel 718 additive manufacturing microstructure control superalloy 600 Pathways to exploit the multi-spot scanning strategy in electron beam additive manufacturing for control of microstructure and defect density Aufsatz The goal of this study is to investigate the impact of beam deflection pattern characteristics on microstructure and porosity formation during Powder Bed Fusion Electron Beam Melting (PBF-EB/M) processing of Inconel 718. Specifically, the complex interplay between “beam return time” and “beam jump distance” and their influence on heat accumulation, porosity, and grain formation is explored. The findings reveal that beam jump distance plays a critical role in the transition from columnar to equiaxed solidification, while beam return time is essential for achieving optimal heat accumulation and minimizing porosity. By controlling these two universal beam deflection pattern characteristics, a novel multi-spot scanning strategy was developed, enabling the formation of a fine-grained equiaxed microstructure. It is demonstrated that sufficient heat accumulation is essential for a pore-free bulk material and can be achieved by short beam return times or small beam jump distances. However, for equiaxed grain formation, a large beam jump distance, i.e., a wide distribution of melt pools, is required. Therefore, heat accumulation must be controlled by means of the beam return time if equiaxed grains are aimed for. Additionally, it is found that higher beam currents are beneficial for equiaxed grain formation, but the strongest impact on the columnar to equiaxed transition is attributed to the beam movement pattern itself. This approach offers insights into microstructure control and process reliability, regardless of the specific PBF technique employed, and enables application-specific microstructure design of Inconel 718. open access Arold, Tizian Krooß, Philipp Niendorf, Thomas doi:10.1016/j.jmrt.2024.06.043 Selektives Elektronenstrahlschmelzen Inconel 718 Rapid Prototyping <Fertigung> Mikrostruktur Superlegierung publishedVersion eissn:2214-0697 Journal of Materials Research and Technology 1044-1053 Volume 31 false </resource>
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