Publications
Phase-field modeling of microstructure evolution of binary and multicomponent alloys during selective laser melting (SLM)
J. Kundin, A. Ramazani, U. Prahl, C. Haase.
TMS 2019 148th Annual Meeting & Exhibition Supplemental Proceedings, Springer, Cham, -, 301-309, (2019)
Abstract
In selective laser melting (SLM), temperature gradients and cooling rates are extremely
large in comparison to the ordinary directional solidification process. Therefore, the
standard analytical methods are not able to predict the dependency of the dendrite
arm spacing on the process parameters correctly. In the current research, we use a
quantitative multicomponent phase-field model to investigate the arm spacing during
the SLM process taking into account the dependency of the tip undercooling on the
solidification velocity. It is found that the precision of the phase-field method can be
estimated by a stability parameter which is defined as a ratio of the numerical resolution
to the solidification velocity and should be chosen larger than a critical value. We
show that our developed results are in good agreement with the theoretically obtained
ones based on Kurz-Fisher method. We investigate the microstructure evolution and
component distribution in FeMn-Al-C solidified alloy during SLM process. The arm
spacing and the Mn distribution are in a very good agreement with the experimental
results. Additionally, the resulting non-standard dependencies of the arm spacing on
the process parameters are compared with analytical calculations, which show excellent
agreement between predictions and experimental measurements.
Keyword(s): selective laser melting; phase-field modeling; dendrite arm spacing
Cite as: https://link.springer.com/chapter/10.1007/978-3-030-05861-6_27
DOI: 10.1007/978-3-030-05861-6_27
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