Control and prediction of electromagnetically favourable microstructure of electrical sheet based on crystal plasticity and heat treatment

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In this project, the research of TP 3 of the first funding period of the research group “Efficient electrical sheet for electro mobility” will be continued and extended upon. The existing focus on the final heat treatment as well as the modelling and characterization of microstructural transformations in the sense of grain size distributions and texture will be supplemented by the study of structure-property-relationships of deformed electrical sheet with respect to its electromagnetic properties on the scale of single or oligocrystals.Within the first funding period, a physically based modelling approach was successfully implemented which allows the integrated simulation of recrystallization and grain growth using the level set method. The formulation of this model tailored model for the electrical sheet material and similar work in the other projects was enabled by a comprehensive characterization campaign with respect to texture and microstructure within TP 3. These efforts will be continued as part of a second funding period. In extension of these aspects, a new central building block is to be added as part of this project: the effect of deformation at the grain and grain boundary scale on the magnetic properties, especially considering the cutting process of the sheet. Over the course of the first funding period, it has been shown that the effect of cutting conditions, mechanical loads and the resulting microstructure is significant but at present cannot be modelled to guide the cutting process based on physical models. Within the second funding period, the work within this project will therefore be structures as follows: single and bicrystal studies on plasticity at grain boundaries at the micro and macroscale will be carried out and correlated directly with electromagnetic characterization. The resulting structure-property-relationships and dependencies on the stress state will then be supplemented by the characterization of rate dependence of the deformation processes and quasi-in-situ deformation of the polycrystal. Finally, the combined insights from these work packages will then be aligned with the existing models and integrated into the continuous view of the entire process chain.