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Lecture

Chemo-mechanical multiphase-field model: Application to phase transformation processes during the heat treatment of steel

Wednesday (26.09.2018)
15:00 - 15:15 S1/01 - A2
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Properties of steel, which determine its applicability, are substantially influenced by the heat treatment.

Simulative tools like the phase-field method are a widely used means of investigating phase transformations during the heat treatment with the aim of optimizing the process conditions.

We present a chemo-mechanical multiphase-field model based on the work of Nestler et al. with extensions from Schneider et al. and Choudhury and Nestler.

The mechanical part is solved according to our recently published work. It is based on the mechanical jump conditions at the interface and uses configurational forces as mechanical driving forces for phase transformations. When compared to the classical interpolation schemes like Voigt/Taylor or Reuss/Sachs, excess energies in the interface are avoided. CALPHAD based chemical driving forces are incorporated to govern the phase transformation.

The quantitative nature of the driving forces at equilibrium is validated for a binary Fe-C system.

Possible applications are given for sequentially (quenching and partitioning) and fully coupled (growth of Widmanstätten ferrite) chemo-mechanical processes.

Speaker:
Ephraim Schoof
Karlsruhe Institute of Technology (KIT)
Additional Authors:
  • PG Kubendran Amos
    Karlsruhe Institute of Technology (KIT)
  • Dr. Daniel Schneider
    Karlsruhe Institute of Technology (KIT)
  • Prof. Dr. Britta Nestler
    Karlsruhe Institute of Technology (KIT)