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
Artikel, Zweitveröffentlichung, Verlagsversion

Kurzbeschreibung (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.

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