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

在本项目中，将继续和扩展课题组“电动交通用高效电片”第一资助期的TP 3研究。现有的重点是最终热处理以及晶粒尺寸分布和织构意义上的微观结构转变的建模和表征，将通过研究变形电片的结构-性能-关系及其在单晶或寡晶尺度上的电磁特性来补充。在第一个资助期内，成功实施了基于物理的建模方法，该方法允许使用水平集方法对再结晶和晶粒生长进行综合模拟。通过对TP 3的纹理和微观结构进行全面的表征，该模型的制定适用于电子薄片材料和其他项目中的类似工作。这些努力将作为第二个筹资期的一部分继续进行。在这些方面的延伸中，作为该项目的一部分，将增加一个新的中心构建块：晶粒和晶界尺度上的变形对磁性能的影响，特别是考虑到板材的切割过程。在第一个资助期的过程中，已经表明切削条件、机械载荷和由此产生的微观结构的影响是显著的，但目前还不能建立模型来指导基于物理模型的切削过程。因此，在第二个资助期内，本项目的工作结构如下：将在微观和宏观尺度上进行晶界塑性的单晶和双晶研究，并与电磁表征直接相关。由此产生的结构-性能关系和对应力状态的依赖关系将由变形过程的速率依赖特性和多晶的准原位变形来补充。最后，来自这些工作包的合并见解将与现有模型对齐，并集成到整个过程链的连续视图中。

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.