Dokument-ID Dokumenttyp Autoren/innen Persönliche Herausgeber/innen Haupttitel Abstract Auflage Verlagsort Verlag Herausgeber (Institution) Erscheinungsjahr Titel des übergeordneten Werkes Jahrgang/Band ISBN Veranstaltung Veranstaltungsort Beginndatum der Veranstaltung Enddatum der Veranstaltung Ausgabe/Heft Erste Seite Letzte Seite URN DOI Lizenz Datum der Freischaltung OPUS4-44175 Zeitschriftenartikel Nadammal, Naresh; Kromm, Arne; Saliwan Neumann, Romeo; Farahbod, Lena; Haberland, Christoph; Portella, Pedro Dolabella Influence of support configurations on the characteristics of selective laser-melted Inconel 718 Samples fabricated using two different support configurations by following identical scan strategies during selective laser melting of superalloy Inconel 718 were characterized in this study. Characterization methods included optical microscopy, electron back-scattered diffraction and x-ray diffraction residual stress measurement. For the scan strategy considered, microstructure and residual stress development in the samples were influenced by the support structures. However, crystallographic texture intensity and the texture components formed within the core part of the samples were almost independent of the support. The formation of finer grains closer to the support as well as within the columnar grain boundaries resulted in randomization and texture intensity reduction by nearly half for the sample built on a lattice support. Heat transfer rates dictated by the support configurations in addition to the scan strategy influenced the microstructure and residual stress development in selective laser-melted Inconel 718 samples. USA Springer 2018 JOM-The Journal of The Minerals, Metals & Materials Society (TMS) 70 3 343 348 10.1007/s11837-017-2703-1 2018-02-16 OPUS4-45100 Zeitschriftenartikel Mishurova, Tatiana; Cabeza, Sandra; Thiede, Tobias; Nadammal, Naresh; Kromm, Arne; Klaus, Manuela; Genzel, Christoph; Haberland, Christoph; Bruno, Giovanni The influence of the support structure on residual stress and distortion in SLM Inconel 718 parts The effect of support structure and of removal from the base plate on the residual stress state in selective laser melted IN718 parts was studied by means of synchrotron X-ray diffraction. The residual stresses in subsurface region of two elongated prisms in as-built condition and after removal from the base plate were determined. One sample was directly built on a base plate and another one on a support structure. Also, the distortion on the top surface due to stress release was measured by contact profilometry. High tensile residual stress values were found, with pronounced stress gradient along the hatching direction. In the sample on support, stress redistribution took place after removal from the base plate, as opposed to simple stress relaxation for the sample without support. The sample on support structure showed larger distortion compared to sample without support. We conclude that the use of a support decreases stress values but stress-relieving heat treatments are still needed. New York, NY Springer Sciences & Business Media 2018 Metallurgical and materials transactions A 49A 7 3038 3046 10.1007/s11661-018-4653-9 2018-06-05 OPUS4-51176 Zeitschriftenartikel Serrano Munoz, Itziar; Mishurova, Tatiana; Thiede, Tobias; Sprengel, Maximilian; Kromm, Arne; Nadammal, Naresh; Nolze, Gert; Saliwan Neumann, Romeo; Evans, Alexander; Bruno, Giovanni The residual stress in as‑built Laser Powder Bed Fusion IN718 alloy as a consequence of the scanning strategy induced microstructure The effect of two types of scanning strategies on the grain structure and build-up of Residual Stress (RS) has been investigated in an as-built IN718 alloy produced by Laser Powder Bed Fusion (LPBF). The RS state has been investigated by X-ray diffraction techniques. The microstructural characterization was performed principally by Electron Backscatter Diffraction (EBSD), where the application of a post-measurement refinement technique enables small misorientations (< 2°) to be resolved. Kernel average misorientation (KAM) distributions indicate that preferably oriented columnar grains contain higher levels of misorientation, when compared to elongated grains with lower texture. The KAM distributions combined with X-ray diffraction stress maps infer that the increased misorientation is induced via plastic deformation driven by the thermal stresses, acting to self-relieve stress. The possibility of obtaining lower RS states in the build direction as a consequence of the influence of the microstructure should be considered when envisaging scanning strategies aimed at the mitigation of RS. 2020 Scientific reports 10 1 14645 urn:nbn:de:kobv:b43-511769 10.1038/s41598-020-71112-9 https://creativecommons.org/licenses/by/4.0/deed.de 2020-09-09