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Delta-Gamma

Delta Gamma is a 2-D simulation of the directional solidification of a ternary steel model alloy containing carbon and manganese. The simulation shows the solidification of a \delta phase dendrite and the subsequent peritectic reaction to the \gamma phase.

The simulation is performed as concentration-coupled and makes use of the 1-D far field approximation and the moving frame option. It is coupled to Thermo-Calc™.

Dendritic solidification before and after peritectic reaction

t=25.0s t=32.5s

Alloy

ExampleT001_Delta_Gamma
Alloy systemFe-C-Mn (Steel.Ges5)
Composition
  • 98 at% Fe
  • 1 at% C
  • 1 at% Mn
Transition
  • solidification
  • peritectic transformation

Simulation conditions

ExampleT001_Delta_Gamma
Dimension2-D
Grid size145x1500 cells
Grid spacing1 micron
Interface thickness4 cells
Boundary conditions
  • east = symmetric
  • west = symmetric
  • top = insulated
  • bottom = fixed
Solid phasesgamma, delta

Results

Concentration

Concentrations at t=35s

Carbon (C) Manganese (Mn)

Solidification

Solidification sequence

-1: interface, 0: liquid, 1: \delta phase, 2: \gamma phase

  • t=1s
    A preset \delta ferrite grain grows dendritically in a temperature gradient (bottom cooling).
  • t=27.5s
    A \gamma austenite grain nucleates and the peritectic reaction/transformation proceeds.
t=1s t=12.5s t=25s t=27.5s t=30s

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