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MM: Fachverband Metall- und Materialphysik
MM 65: Additive Manufacturing: Microstructure Development
MM 65.1: Talk
Thursday, March 21, 2024, 16:45–17:00, C 230
Atomistic Simulations of Laser-based Powder Bed Fusion — Fabio Oelschläger1, Azad Gorgis1, Jonas Schmid1, Kevin Vietz1, Dominic Klein1, Sarah Müller2, and •Johannes Roth1 — 1FMQ, Universität Stuttgart, Germany — 2GSaME, Universität Stuttgart, Germany
Applications of additive technologies continue to demand an improvement in quality and reproducibility. Using atomistic molecular dynamics simulations we are able to better understand the root causes for defects and may also be able to derivate actions for defect avoidance. The biggest challenge to the simulations are the scales: although we use multi-million atom systems and run ``long'' simulations we have to scale parameters like particle size, laser power, power density, scanning speed, laser focus diameter and gravity.
Using parameter studies for scanning speed and laser power while also including the influence of protective argon gas, different inclusion defects in pure aluminum particles are shown. The simulation of powder beds formed by spheres of different sizes show holes which vanish if filled with vacuum but persist if the simulation box is filled with protective gas allowing insight into the defect formation. Recrystallization in a box filled with a bimodal distribution of aluminum particles has been observed. Additionally, different configurations of binary materials made of aluminum and titanium have been simulated: the study compares spheres formed by a core of aluminum and an outer shell of titanium or vice versa, and homogenous spheres of a TiAl alloy.
Keywords: laser-based powder bed fusion; molecular dynamcs simulations; aluminum; titanium; defects