Publications
Microstructure evolution of binary and multicomponent manganese steels during selective laser melting: phase-field modeling and experimental validation
J. Kundin, A. Ramazani, U. Prahl, C. Haase.
Metallurgical and Materials Transactions A, 50, 2022-2040, (2019)
Abstract
In additive manufacturing processes, solidification velocities are extremely high in comparison
to ordinary directional solidification. Therefore, the dependencies of the primary dendrite arm
spacing (PDAS) on the process parameters deviate from the dependencies predicted by standard
analytical methods. In this work, we investigate the microstructure evolution and element
distribution in Fe-18.9Mn and Fe-18.5Mn-Al-C alloys solidified during the selective laser
melting process. A quantitative multicomponent phase-field model verified by Green-function
calculations (Karma, Rappel: Phys. Rev. E, 1998, 57, 4323) and the convergence analysis is
used. The resulting non-standard dependencies of the PDAS on the process parameters in a wide
range of solidification velocities are compared with analytical calculations. It is shown that the
numerical values of the PDAS are similar to the values predicted by the Kurz–Fisher method for
the low and intermediate solidification velocities and are smaller for the solidification velocities
higher than 0.03 m/s. The PDAS and the Mn distribution in a Fe-18.5Mn-Al-C alloy are
compared to the experimental results and a very good agreement is found.
DOI: 10.1007/s11661-019-05143-x
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