Approach to application-oriented properties of electrical steels by means of cold rolling and heat treatment

1897课题组的主要目标是基于模型预测无取向电工板的生产和加工过程中的微结构和织构演变，以及操作过程中的相应电磁性能。因此，在第一阶段，参与机构开发了描述单一生产步骤的单独模型。此外，还建立了一个实验过程链来验证这些模型。在第二个阶段中，必须将这些独立的模型链接在一起，以实现通过流程建模。通过过程建模将被用于确定两种不同应用(分别具有最小比损耗和较高磁场强度)的定制性能的两种电工薄板的生产工艺参数。在该研究小组中，IBF研究冷轧过程。在第一阶段，研究表明，总应变和每道次应变影响冷轧织构的演变。然而，通常使用的串连轧制会增加不需要的织构成分(例如γ纤维)。因此，在第二阶段将研究非常规轧制策略，如非对称轧制。这些轧制策略导致较高的剪切变形，从而改善了冷轧织构。此外，在模拟研究中还显示了热轧织构的强烈影响。例如，旋转立方成分的大部分在冷轧过程中保持不变。这种所需织构成分可能与部分再结晶的热轧组织有关。因此，IBF使用的模型必须加以扩展，以也考虑到这些微观结构。最后，将使用扩展的UND链接模型来规划上述流程链。

The main goal of the research group 1897 is the model-based prediction of microstructure and texture evolution during production and processing of non-oriented electrical sheets and the corresponding electro-magnetic properties during operation. Therefore, separate models describing the single production steps were developed at the participating institutes during the first period. Furthermore, an experimental process chain was established to validate these models. Within the second period, these separate models have to be linked to enable through process modeling. Through process modelling will then be used to determine process parameters for the production of two electrical sheets with tailored properties for two different applications (minimum specific losses and higher magnetic field strength, respectively).Within this research group, the IBF investigates the process of cold rolling. During the first period, it was shown, that the total strain as well as the strain per pass affect the texture evolution during cold rolling. However, tandem rolling, which is usually used, promotes undesired texture components (e.g. the γ-fiber). Therefore, in the second period unconventional rolling strategies such as asymmetrical rolling will be investigated. These rolling strategies result in higher shear deformation, which improves the cold-rolled texture. Furthermore, in a simulation study the strong effect of the hot-rolled texture was shown. For instance, large parts of the rotated cube components remain unchanged during cold rolling. Such desired texture components might be related to a partly recrystallized hot-rolled microstructure. Thus, the model used at the IBF has to be extended to also account for these microstructures. Finally, the extended und linked model will be used to lay out the above-mentioned process chains.