Microsegregation during Solidification

This example shows how Thermo-Calc together with the add-on Diffusion
module (DICTRA) can be used to investigate and predict microsegregation during solidification, also known as solute redistribution during solidification.


Download the Example

Example explanation | Calculation file

About the Microsegregation during Solidification Example

This example shows only a few of the capabilities of Thermo-Calc together with the add-on Diffusion module (DICTRA) to investigate and predict microsegregation during solidification (solute redistribution during solidification) . It is based on a real case where the elemental distribution of a continuously cast steel was measured, revealing the concentration of the elements Si, Mn and P. 

Calculated Microsegregation During Solidification Using Thermo Calc 600 Seconds

Calculated Microsegregation During Solidification Using Thermo Calc 3000 Seconds
Calculated segregation of all elements just after final solidification (600 sec, top) and after cooling to 900°C (3000 sec, bottom): just after final solidification there is positive P segregation in the final solidification pools between the dendrite arms. On further cooling, P redistribution is controlled by slow Mn and Si diffusion resulting in the unexpected, but experimentally observed, peak shift and negative P segregation.

Example explanation | Calculation file

Relevant Topics 

  • Diffusion module (DICTRA)
  • Scheil Solidification Simulation
  • Casting
  • Steels and iron-based alloys