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Influence of Electron Beam Powder Bed Fusion Process Parameters at Constant Volumetric Energy Density on Surface Topography and Microstructural Homogeneity of a Titanium Aluminide Alloy
Institute of Materials Science (IfWW), Technische Universität Dresden, 01069, Dresden, Germany; Fraunhofer Institute for Material and Beam Technology IWS, 01277, Dresden, Germany.ORCID iD: 0000-0002-3304-4283
Chair of Materials Test Engineering (WPT), TU Dortmund University, 44227, Dortmund, Germany.ORCID iD: 0000-0002-9960-735x
Institute of Materials Science (IfWW), Technische Universität Dresden, 01069, Dresden, Germany; Fraunhofer Institute for Material and Beam Technology IWS, 01277, Dresden, Germany.ORCID iD: 0000-0001-8126-8532
Fraunhofer Institute for Material and Beam Technology IWS, 01277, Dresden, Germany.ORCID iD: 0000-0003-1716-2156
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2023 (English)In: Advanced Engineering Materials, ISSN 1438-1656, E-ISSN 1527-2648, Vol. 25, no 15, article id 2201871Article in journal (Refereed) Published
Abstract [en]

In powder bed fusion additive manufacturing, the volumetric energy density E V is a commonly used parameter to quantify process energy input. However, recent results question the suitability of E V as a design parameter, as varying the contributing parameters may yield different part properties. Herein, beam current, scan velocity, and line offset in electron beam powder bed fusion (PBF-EB) of the titanium aluminide alloy TNM–B1 are systematically varied while maintaining an overall constant E V. The samples are evaluated regarding surface morphology, relative density, microstructure, hardness, and aluminum loss due to evaporation. Moreover, the specimens are subjected to two different heat treatments to obtain fully lamellar (FL) and nearly lamellar (NLγ) microstructures, respectively. With a combination of low beam currents, low-to-intermediate scan velocities, and low line offsets, parts with even surfaces, relative densities above 99.9%, and homogeneous microstructures are achieved. On the other hand, especially high beam currents promote the formation of surface bulges and pronounced aluminum evaporation, resulting in inhomogeneous banded microstructures after heat treatment. The results demonstrate the importance of considering the individual parameters instead of E V in process optimization for PBF-EB.

Place, publisher, year, edition, pages
John Wiley & Sons, 2023. Vol. 25, no 15, article id 2201871
Keywords [en]
additive manufacturing, aluminum evaporation, electron beam powder bed fusion, heat treatments, process parameters, titanium aluminides
National Category
Metallurgy and Metallic Materials
Research subject
Manufacturing Systems Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-97281DOI: 10.1002/adem.202201871ISI: 000976798900001Scopus ID: 2-s2.0-85151432356OAI: oai:DiVA.org:ltu-97281DiVA, id: diva2:1758694
Note

Godkänd;2023;Nivå 0;2023-08-15 (marisr);Konferensartikel i tidskrift

Special Issue: Structural Materials;

Funder: Deutsche Forschungsgemeinschaft, DFG (404665753, 406109547);

License fulltext: CC-BY. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Available from: 2023-05-23 Created: 2023-05-23 Last updated: 2023-08-15Bibliographically approved

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Brueckner, Frank

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