3D multi-layer grain structure simulation of powder bed fusion additive manufacturing

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autor(en): Köpf J, Gotterbarm M, Markl M, Körner C
Zeitschrift: Acta Materialia
Verlag: Acta Materialia Inc
Jahr der Veröffentlichung: 2018
Band: 152
Seitenbereich: 119-126
ISSN: 1359-6454


Abstract

In powder bed fusion (PBF) additive manufacturing,
powder layers are locally melted with a laser or an electron beam to
build a component. Hatching strategies and beam parameters as beam
power, scan velocity and line offset significantly affect the grain structure
of the manufactured part. While experiments reveal the result of
specific parameter combinations, the precise impact of distinct
parameters on the resulting grain structure is widely unknown. This
knowledge is necessary for a reliable prediction of the microstructure
and consequently the mechanical properties of the manufactured part.

We
introduce the adaption of a three-dimensional model for the prediction
of dendritic growth for use with PBF. The heat input is calculated using
an analytical solution of the transient heat conduction equation.
Massively parallel processing on a high-performance cluster computer
allows the computation of the grain structure on the scale of small
parts within reasonable times.

The model is
validated by accurately reproducing experimental grain structures of
Inconel 718 test specimens manufactured by selective electron beam
melting. The grain selection zone within the first layers as well as the
subsequent microstructure in several millimeters build height is
modeled in unprecedented level of detail. This model represents the
cutting-edge of grain structure simulation in PBF and enables a reliable
numerical prediction of appropriate beam parameters for arbitrary
applications.



FAU-Autoren / FAU-Herausgeber

Gotterbarm, Martin
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)
Köpf, Johannes
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)
Körner, Carolin Prof. Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)
Markl, Matthias Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Werkstoffkunde und Technologie der Metalle)


Zitierweisen

APA:
Köpf, J., Gotterbarm, M., Markl, M., & Körner, C. (2018). 3D multi-layer grain structure simulation of powder bed fusion additive manufacturing. Acta Materialia, 152, 119-126. https://dx.doi.org/10.1016/j.actamat.2018.04.030

MLA:
Köpf, Johannes, et al. "3D multi-layer grain structure simulation of powder bed fusion additive manufacturing." Acta Materialia 152 (2018): 119-126.

BibTeX: 

Zuletzt aktualisiert 2018-29-09 um 14:50