FEMS EUROMAT 2023
Lecture
04.09.2023 (CEST)
Deformation under gravity of stainless-steel binder jetted components during the sintering step
EH

Prof. Dr. Eduard Hryha

Chalmers University of Technology

Hryha, E. (Speaker)¹; Cabo Rios, A.¹; Olevsky, E.²; Persson, M.³
¹Chalmers University of Technology, Gothenburg (Sweden); ²San Diego State University; ³Digital Metal AB, Höganäs (Sweden)
Vorschau
21 Min. Untertitel (CC)

Green components manufactured by binder jetting typically undergo debinding and sintering to achieve the required final properties for the intended applications. During sintering, complex geometries with large overhangs may experience severe deformation caused by gravity forces. A developed sintering model, based on the continuum theory of sintering, is used for the prediction of shape deformation and volume shrinkage during sintering. This model explicitly includes the effect of the high initial green porosity and phase transformations (i.e. delta-ferrite) of 316L stainless steel within the constitutive parameters comprised in the constitutive equation used. The model parameters used were previously obtained by using dilatometry experiments performed under specific sintering conditions and methodology. Several geometries with different overhang length, thickness and angles were BJ printed and sintered up to 1370°C to reach almost full density. Detailed comparison of sintered components and simulation results was done regarding shape and internal porosity distribution. The external shape of various sintered components was characterized by X-ray computed tomography. Also, the internal porosity distribution was obtained using light optical microscopy of several cross-sections. The comparison of this experimental data against the simulation results proved the good performance of the modelling methodology proposed.

Abstract

Abstract

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