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Authors: Megahed, Sandra
Krämer, Karl Michael
Kontermann, Christian
Heinze, Christoph
Udoh, Annett
Weihe, Stefan
Oechsner, Matthias
Title: Micro-twinning in IN738LC manufactured with laser powder bed fusion
Issue Date: 2023 Zeitschriftenartikel 16 Materials 16 (2023), No. 5918
ISSN: 1996-1944
Abstract: 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.
Appears in Collections:13 Zentrale Universitätseinrichtungen

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