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Investigation of the Application of a C-ring Geometry to validate the Stress Relief Heat Treatment Simulation of Additive Manufactured Austenitic Stainless Steel Parts via Displacement∗

Untersuchung der Anwendung einer C-Ring-Geometrie zur Validierung der Simulation der Spannungsarmglühbehandlung von additiv hergestellten Teilen aus austenitischem rostfreiem Stahl durch Verschiebung
B. El-Sari, M. Biegler and M. Rethmeier


Directed energy deposition is a metal additive manufacturing process that builds parts by joining material in a layer-by-layer fashion on a substrate. Those parts are exposed to rapid thermo-cycles which cause steep stress gradients and the layer-upon-layer manufacturing fosters an anisotropic microstructure, therefore stress relief heat treatment is necessary. The numerical simulation can be used to find suitable parameters for the heat treatment and to reduce the necessary efforts to perform an effective stress relieving. Suitable validation experiments are necessary to verify the results of the numerical simulation.

In this paper, a 3D coupled thermo-mechanical model is used to simulate the heat treatment of an additive manufactured component to investigate the application of a C-ring geometry for the distortion-based validation of the numerical simulation. Therefore, the C-ring samples were 3D scanned using a structured light 3D scanner to quantify the distortion after each process step.


Directed Energy Deposition – gerichtete Energieeinbringung – ist ein Metall-additives Fertigungsverfahren, das Teile durch schichtweises Verbinden von Material auf einem Substrat aufbaut. Diese Teile werden schnellen Thermozyklen ausgesetzt, die steile Spannungsgradienten verursachen, zugleich fördert die Schicht-auf-Schicht-Fertigung eine anisotrope Mikrostruktur, weshalb eine Spannungsarmglühbehandlung erforderlich ist. Die numerische Simulation kann verwendet werden, um geeignete Parameter für die Wärmebehandlung zu finden und den notwendigen Aufwand für ein effektives Spannungsarmglühen zu reduzieren. Geeignete Validierungsexperimente sind notwendig, um die Ergebnisse der numerischen Simulation zu verifizieren.

In dieser Arbeit wird ein 3D-gekoppeltes thermo-mechanisches Modell verwendet, um die Wärmebehandlung eines additiv hergestellten Bauteils zu simulieren, um so die Anwendung einer C-Ring-Geometrie für die verzugsbasierte Validierung der numerischen Simulation zu untersuchen. Dafür wurden die C-Ring-Proben mit einem 3D-Scanner mit strukturiertem Licht 3D-gescannt, um die Verformung nach jedem Prozessschritt zu quantifizieren.

3 (corresponding author/Kontakt)

Reworked version of a lecture held at the Simulationsforum 2019 Schweißen und Wärmebehandlung, November 5–7, 2019, Weimar, Germany


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Published Online: 2020-08-10
Published in Print: 2020-08-13

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