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Thermo-mechanically coupled simulation of high manganese TRIP/TWIP steel

By Franz Roters (MPI für Eisenforschung)
Co-authors: Su Leen Wong (MPI für Eisenforschung)
Pratheek Shanthraj (MPI für Eisenforschung)
Dierk Raabe (MPI für Eisenforschung)

Even though it is well known that most of the plastic deformation energy is dissipated as heat, to date most simulations of crystal plasticity are performed in an isothermal setting. To overcome this obvious shortcoming, i.e. for considering self-heating and thus activation of otherwise non-activated deformation mechanisms, we have recently extended the Düsseldorf Advanced Material Simulation Kit (DAMASK) [1, 2], into a multi-physics simulation framework able to perform fully coupled thermo-mechanical simulations. Using this newly developed framework, we investigate the temperature and loading rate dependent behavior of high manganese TRIP/TWIP steels, which show an extraordinary combination of high strength and formability and thus dissipate substantial deformation energy leading to a significant temperature increase. In addition, this class of materials is especially interesting with respect to thermo-mechanical simulations due to the fact that, depending on the stacking fault energy (SFE), these materials show a variety of different plastic deformation mechanisms, i.e. dislocation slip, deformation twinning, and martensitic phase transformation. The employed physics-based constitutive model [3, 4] incorporates the activation of these three possible deformation mechanisms depending on the SFE. Since the SFE varies as a function of temperature, it is very likely that the activated deformation modes can dynamically change during loading, thus requiring a fully coupled thermo-mechanical approach. [1] Düsseldorf Advanced Material Simulation Kit (DAMASK): https://damask.mpie.de [2] F. Roters, P. Eisenlohr, C. Kords, D.D. Tjahjanto, M. Diehl, D. Raabe: DAMASK: the Düsseldorf Advanced MAterial Simulation Kit for studying crystal plasticity using an FE based or a spectral numerical solver, IUTAM Symposium on Linking Scales in Computations: From Microstructure to Macro-scale Properties, Procedia IUTAM 3 (2012) 3 – 10 [3] D. R. Steinmetz, T. Jäpel, B. Wietbrock, P. Eisenlohr, I. Gutierrez-Urrutia, A. Saeed-Akbari, T. Hickel, F. Roters, D. Raabe: Revealing the strain-hardening behavior of twinning-induced plasticity steels: Theory, simulations, experiments, Acta Materialia 61 (2013) 494 – 510 [4] S. L. Wong, M. Madivala, U. Prahl, F. Roters, D. Raabe: A crystal plasticity model for twinning- and transformation-induced plasticity, Acta Materialia 118 (2016) 140 – 151

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