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

1897研究组的主要目标是基于模型预测无取向电薄板在生产和加工过程中的微观结构和织构演变以及运行过程中相应的电磁特性。因此，在第一阶段，参与研究的机构开发了描述单个生产步骤的单独模型。建立了实验流程链，对模型进行了验证。在第二个阶段，这些独立的模型必须通过流程建模连接起来。通过工艺建模，然后将用于确定生产两种不同应用（分别为最小比损耗和更高磁场强度）的具有定制特性的两种电子片的工艺参数。在这个研究小组中，IBF研究冷轧过程。结果表明，在冷轧过程中，总应变和每道次应变对织构演化有显著影响；然而，通常使用的串联轧制会增加不需要的织构成分（例如γ纤维）。因此，第二阶段将研究非对称轧制等非常规轧制策略。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，在模拟研究中还表明了热轧织构的强烈影响。例如，在冷轧过程中，旋转的立方体部件的大部分保持不变。这种期望的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，利用扩展后的关联模型对上述流程链进行布局。

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.