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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 (2023)
Micro-Twinning in IN738LC Manufactured with Laser Powder Bed Fusion.
In: Materials, 2023, 16 (17)
doi: 10.26083/tuprints-00024497
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: Micro-Twinning in IN738LC Manufactured with Laser Powder Bed Fusion
Language: English
Date: 11 September 2023
Place of Publication: Darmstadt
Year of primary publication: 2023
Publisher: MDPI
Journal or Publication Title: Materials
Volume of the journal: 16
Issue Number: 17
Collation: 16 Seiten
DOI: 10.26083/tuprints-00024497
Corresponding Links:
Origin: Secondary publication DeepGreen

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.

Uncontrolled Keywords: laser powder bed fusion, IN738LC, microstructure, creep, micro-twinning
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-244973
Classification DDC: 600 Technology, medicine, applied sciences > 620 Engineering and machine engineering
Divisions: 16 Department of Mechanical Engineering > Center for Engineering Materials, State Materials Testing Institute Darmstadt (MPA) Chair and Institute for Materials Technology (IfW)
Date Deposited: 11 Sep 2023 12:20
Last Modified: 31 Oct 2023 12:50
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/24497
PPN: 512764522
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