ICAMS / Interdisciplinary Centre for Advanced Materials Simulation

Spacing selection in columnar peritectic solidification

Solidification of peritectic steel grades in continuous casting is subject to inherent problems due to the peritectic transformation of ferrite to austenite close to the tip of the solidification zone, where the material has little to no ability to resist mechanical load. In a previous project (STKS_16_01_peritectic bending) this process was analyzed by phase-field simulation using the MICRESS code and analyzing the mechanical deformation by ABAQUS. It was demonstrated that the position of the onset of peritectic transformation relative to the tip of the dendrites and relative to the contact point between neighboring dendrites is of critical relevance to this problem. Up to now the understanding of spacing selection during peritectic solidification is rather limited. In particular it can be expected, that an early onset of the peritectic transformation changes the spacing selection considerably in relation to single phase solidification. In order to investigate the related phenomena, large scale simulations have to be performed which are only possible by parallelized computing. The project aims to establish the ground for such large scale phase-field simulations of columnar peritectic solidification using the OpenPhase code.

Results from Micress simulations for peritectic dendrites. The tip radius corresponds to carbon concentration in different phases.

AlCu benchmarks have been set up for OpenPhase. Tip radii of peritectic dendrites with different carbon concentrations have been calculated by MICRESS. We also calculated the tip undercooling of the peritectic dendrites with different cooling rates and temperature gradients.

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