Simulation of Microsegregation in Multicomponent Alloys During Solidification

A phase‐field model is applied to the simulation of microsegregation and microstructure formation during the solidification of multicomponent alloys. The results of the one‐dimensional numerical simulations show good agreement with those from the Clyne–Kurz equation. Phase‐field simulations of non‐i...

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Bibliographic Details
Published in:Steel research international 2012-08, Vol.83 (8), p.723-732
Main Authors: Salvino, Ingrid M., de-Olivé Ferreira, Leonardo, Ferreira, Alexandre Furtado
Format: Article
Language:English
Subjects:
Alloys
Carbon
Computer simulation
dendrite
Dendritic structure
Mathematical models
Microstructure
Morphology
quaternary alloys
Simulation
Solidification
steel
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Summary:A phase‐field model is applied to the simulation of microsegregation and microstructure formation during the solidification of multicomponent alloys. The results of the one‐dimensional numerical simulations show good agreement with those from the Clyne–Kurz equation. Phase‐field simulations of non‐isothermal dendrite growth are examined. Two‐dimensional computation results exhibit different dendrites in multicomponent alloys for different solute concentrations. Changes in carbon concentration appear to affect dendrite morphology. This is due to a larger concentration and a lower equilibrium partition coefficient for carbon. On the other hand, changes in phosphorus concentration affect the dendrites and interface velocity in multicomponent alloys during solidification when phosphorus content is increased from 10−3 mol% P. With additional manganese, the solidification kinetics slow down; dendrite morphology, however, is not affected. The potential of the phase‐field model for applications pertaining to solidification has been demonstrated through the simulations herein. Understanding dendritic solidification is utterly important because the microstructural scales of the dendrite determine the material properties. The phase‐field model is known to be a tool for describing the pattern evolution of the interface between mother and new phases in non‐equilibrium state. The potential of the phase‐field model for applications pertaining to solidification has been demonstrated through the simulations herein.
ISSN:1611-3683
1869-344X
DOI:10.1002/srin.201200003