An Experimental Approach To Acquire Material-specific Parameters To Simulate The Sintering Process In Binder Jetting, Using In-situ Gravitational Beam Bending Tests And Dilatometry

Authors:

Moritz Greifzu (Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS, Germany),
Fabian Peter (Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS, Germany),
Tarang Dineshchandra Mehta (Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS, Germany),
Joanna Eckardt (Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS, Germany),
Sohan Acharya (Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS, Germany),
Axel Marquardt (Technische Universität Dresden, Germany),
Lukas Stepien (Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS, Germany),
Elena Lopez (Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS, Germany),
Frank Brückner (Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS, Germany),
Christoph Leyens (Fraunhofer-Institut für Werkstoff- und Strahltechnik IWS, Germany)

Abstract:

Binder jetting (BJ) is a sinter-based additive manufacturing technology with several advantages over laser or electron beam-based powder bed processes. This includes faster build rates, non-necessity of support structures and no introduction of thermal stress into the part during the build. On the other hand, BJ parts shrink considerably during sintering making it more challenging to produce parts within tolerances. Recently, software to simulate and compensate this distortion has been commercialized. Since the algorithm is based on a phenomenological model, experiments have to be conducted to feed material parameters into this model for correct simulation of a specific alloy. Here, an experimental approach is presented using dilatometry and in-situ gravitational beam bending to perform a full characterization of stainless steel powder 316L , and the extraction of the relevant data for the simulation.

DOI:

https://doi.org/10.59499/WP225371941