46673
2018
eng
717
735
4
7
article
ASTM International
USA, West Conshohocken
1
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Residual stress in selective laser melted Inconel 718: Influence of the removal from base plate and deposition hatch length
The residual stress distribution in IN718 elongated prisms produced by Selective Laser Melting was studied by means of neutron (bulk) and laboratory X-ray (surface) diffraction.
Two deposition hatch lengths were considered. A horizontal plane near the top surface (perpendicular to the building direction) and a vertical plane near the lateral surface (parallel to the building direction) were investigated. Samples both in as-built (AB) condition and removed (RE) from the base plate were characterized.
While surface stress fields seem constant for AB condition, X-ray diffraction shows stress gradients along the hatch direction in the RE condition. The stress profiles correlate with the distortion maps obtained by tactile probe measurements.
Neutron diffraction shows bulk stress gradients for all principal components along the main sample directions. We correlate the observed stress patterns with the hatch length, i.e. with its effect on temperature gradients and heat flow. The bulk stress gradients partially disappear after removal from the baseplate.
Materials, Performance & Characterization
10.1520/MPC20170119
2379-1365
08.04.2020
Tobias Thiede
S. Cabeza
Tatiana Mishurova
N. Nadammal
Arne Kromm
Johannes Bode
C. Haberland
Giovanni Bruno
eng
uncontrolled
Residual stress
eng
uncontrolled
Additive manufacturing
eng
uncontrolled
Neutron diffraction
eng
uncontrolled
Selective laser melting
eng
uncontrolled
Laboratory X-ray diffraction
eng
uncontrolled
Coordinate measurement machine
eng
uncontrolled
IN718
Ingenieurwissenschaften und zugeordnete Tätigkeiten
5 Werkstofftechnik
8 Zerstörungsfreie Prüfung
8.5 Röntgenbildgebung
9 Komponentensicherheit
9.2 Versuchsanlagen und Prüftechnik
9.4 Integrität von Schweißverbindungen
Material
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
5.0 Abteilungsleitung und andere
Additive Fertigung
57819
2023
eng
1
6
30
article
Elsevier
Amsterdam
1
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High-resolution Bragg-edge neutron radiography detects grain morphology in PBF-LB/M IN718
One of the main advantages of metal additive manufacturing (MAM) techniques is their ability to produce components with site-specific microstructural features. Nevertheless, microstructural defects and lack of repeatability are still major concerns in MAM. In this study, a laser powder bed fusion (PBF-LB/M) IN718 material, produced using two different scan length vectors, is investigated using Bragg-edge neutron 2D imaging (BENI) combined with electron backscatter diffraction (EBSD) analysis. BENI is able to detect, on a macroscopic scale, process-induced changes in texture in a large field of view covering the entire sample (20×80 mm2). In addition, high-resolution BENI (HR-BENI), with a pixel size of 12.8 µm, provides a micro-scale examination of the local variations of texture and grain morphology, otherwise undistinguishable using the standard resolution. As such, HR-BENI offers a straightforward and detailed way of screening the integrity of MAM parts at cm-length scales.
Materialia
10.1016/j.mtla.2023.101827
2589-1529
publish
14.08.2023
Itziar Serrano Munoz
Beate Pfretzschner
Arne Kromm
Naresh Nadammal
N. Kardjilov
Henning Markötter
T. Neuwirth
M. Schulz
Axel Griesche
eng
uncontrolled
Bragg-edge neutron 2D imaging (BENI)
eng
uncontrolled
Metal additive manufacturing (MAM)
eng
uncontrolled
IN718 PBF-LB/M
eng
uncontrolled
Crystallographic texture control
eng
uncontrolled
Electron backscatter diffraction (EBSD)
Ingenieurwissenschaften und zugeordnete Tätigkeiten
8 Zerstörungsfreie Prüfung
8.5 Röntgenbildgebung
9 Komponentensicherheit
9.4 Integrität von Schweißverbindungen
Material
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")
Additive Fertigung