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WEB Unified Modelling of Thermo-Chemo-Mechanical Coupling Phenomena during Thermomechanical Processing of Metallic Materials

Wednesday (23.09.2020)
15:55 - 16:10 M: Modelling and Simulation 2
Part of:

Reliable simulation tools predicting the material behaviour under thermomechanical loads are essential for process optimisation and alloy design. By speeding up the development process and reducing the number of trial and error cycles, they can help to improve the resulting material properties, make manufacturing processes faster and reduce the energy consumption. Furthermore, they can support the design of improved alloys for particular applications and required material properties.

The material behaviour during thermomechanical processing and the resulting properties are significantly affected by the chemical composition and the microstructure evolution. Therefore it is crucial to understand the various thermo-chemo-mechanical coupling phenomena that may occur. Besides direct mutual interactions, such as the temperature increase due to dissipation during plastic deformation, in turn leading to softening of the material, further coupling phenomena take place. In the context of metallic materials, such further phenomena comprise recrystallization, grain coarsening, phase transformation and precipitate formation.

In the joint project M3 “TCMPrecipSteel” together with D. Raabe and M. Diehl (Max-Planck Institut für Eisenforschung) within the DFG priority program 1713, we addressed the unified modelling of the thermomechanical behaviour and microstructure evolution of microalloyed steels from two different perspectives. While our partners used a spatially resolved microstructure model to investigate local effects, we used a mean-field model with the aim to provide an efficient simulation tool for industrial applications. In order to guarantee consistency with fundamental physical principles, the model is derived from a comprehensive thermodynamic framework.

The mean-field model is numerically implemented as a standalone process simulation tool. Its capability to consistently predict the interplay between elastoplastic deformation, microstructure evolution, dynamic hardening and softening and the related temperature change is demonstrated by numerical studies and validated by experimental data from both literature and own experiments. Besides, a benchmark of different modelling approaches for the formation of precipitates applied in various projects of the priority program 1713 is presented.

Lukas Kertsch
Fraunhofer Institute for Mechanics of Materials IWM
Additional Authors:
  • Dirk Helm
    Fraunhofer-Institut für Werkstoffmechanik IWM
  • Martin Diehl
    Max-Planck-Institut für Eisenforschung
  • Dierk Raabe
    Max-Planck-Institut für Eisenforschung