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Micro-Twinning in IN738LC Manufactured with Laser Powder Bed Fusion

Components manufactured with Metal Laser Powder Bed Fusion (PBF-LB/M) are built in a layerwise fashion. The PBF-LB/M build orientation affects grain morphology and orientation. Depending on the build orientation, microstructures from equiaxed to textured grains can develop. In the case of a textured...

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Autores principales: Megahed, Sandra, Krämer, Karl Michael, Kontermann, Christian, Heinze, Christoph, Udoh, Annett, Weihe, Stefan, Oechsner, Matthias
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10488710/
https://www.ncbi.nlm.nih.gov/pubmed/37687610
http://dx.doi.org/10.3390/ma16175918
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author Megahed, Sandra
Krämer, Karl Michael
Kontermann, Christian
Heinze, Christoph
Udoh, Annett
Weihe, Stefan
Oechsner, Matthias
author_facet Megahed, Sandra
Krämer, Karl Michael
Kontermann, Christian
Heinze, Christoph
Udoh, Annett
Weihe, Stefan
Oechsner, Matthias
author_sort Megahed, Sandra
collection PubMed
description Components manufactured with Metal Laser Powder Bed Fusion (PBF-LB/M) are built in a layerwise fashion. The PBF-LB/M build orientation affects grain morphology and orientation. Depending on the build orientation, microstructures from equiaxed to textured grains can develop. In the case of a textured microstructure, a clear anisotropy of the mechanical properties affecting short- and long-term mechanical properties can be observed, which must be considered in the component design. Within the scope of this study, the IN738LC tensile and creep properties of PBF-LB/M samples manufactured in 0° (perpendicular to build direction), 45° and 90° (parallel to build direction) build orientations were investigated. While the hot tensile results (at 850 °C) are as expected, where the tensile properties of the 45° build orientation lay between those of 0° and 90°, the creep results (performed at 850 °C and 200 MPa) of the 45° build orientation show the least time to rupture. This study discusses the microstructural reasoning behind the peculiar creep behavior of 45° oriented IN738LC samples and correlates the results to heat-treated microstructures and the solidification conditions of the PBF-LB/M process itself.
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spelling pubmed-104887102023-09-09 Micro-Twinning in IN738LC Manufactured with Laser Powder Bed Fusion Megahed, Sandra Krämer, Karl Michael Kontermann, Christian Heinze, Christoph Udoh, Annett Weihe, Stefan Oechsner, Matthias Materials (Basel) Article Components manufactured with Metal Laser Powder Bed Fusion (PBF-LB/M) are built in a layerwise fashion. The PBF-LB/M build orientation affects grain morphology and orientation. Depending on the build orientation, microstructures from equiaxed to textured grains can develop. In the case of a textured microstructure, a clear anisotropy of the mechanical properties affecting short- and long-term mechanical properties can be observed, which must be considered in the component design. Within the scope of this study, the IN738LC tensile and creep properties of PBF-LB/M samples manufactured in 0° (perpendicular to build direction), 45° and 90° (parallel to build direction) build orientations were investigated. While the hot tensile results (at 850 °C) are as expected, where the tensile properties of the 45° build orientation lay between those of 0° and 90°, the creep results (performed at 850 °C and 200 MPa) of the 45° build orientation show the least time to rupture. This study discusses the microstructural reasoning behind the peculiar creep behavior of 45° oriented IN738LC samples and correlates the results to heat-treated microstructures and the solidification conditions of the PBF-LB/M process itself. MDPI 2023-08-29 /pmc/articles/PMC10488710/ /pubmed/37687610 http://dx.doi.org/10.3390/ma16175918 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Megahed, Sandra
Krämer, Karl Michael
Kontermann, Christian
Heinze, Christoph
Udoh, Annett
Weihe, Stefan
Oechsner, Matthias
Micro-Twinning in IN738LC Manufactured with Laser Powder Bed Fusion
title Micro-Twinning in IN738LC Manufactured with Laser Powder Bed Fusion
title_full Micro-Twinning in IN738LC Manufactured with Laser Powder Bed Fusion
title_fullStr Micro-Twinning in IN738LC Manufactured with Laser Powder Bed Fusion
title_full_unstemmed Micro-Twinning in IN738LC Manufactured with Laser Powder Bed Fusion
title_short Micro-Twinning in IN738LC Manufactured with Laser Powder Bed Fusion
title_sort micro-twinning in in738lc manufactured with laser powder bed fusion
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10488710/
https://www.ncbi.nlm.nih.gov/pubmed/37687610
http://dx.doi.org/10.3390/ma16175918
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