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

通过冷轧和热处理提高电工钢应用性能的方法

• 批准号: 255707264
• 负责人: Professor Dr.-Ing. Gerhard Hirt
• 金额: --
• 依托单位: Institut für Bildsame Formgebung (IBF)
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/255707264?language=en
• 关键词: Approach; application; oriented; properties; electrical

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.

1897研究小组的主要目标是基于模型预测无取向电工钢生产和加工过程中的微观结构和织构演变，以及操作过程中相应的电磁性能。因此，在第一阶段，参与研究所开发了描述单一生产步骤的单独模型。此外，建立了一个实验过程链，以验证这些模型。在第二个阶段中，这些独立的模型必须被链接，以支持通过流程建模。通过过程建模，将用于确定生产两种电工板的工艺参数，这两种电工板具有针对两种不同应用（分别为最小比损耗和更高的磁场强度）的定制特性。在该研究小组中，IBF研究了冷轧工艺。在第一阶段，它被示出，总应变以及每道次应变影响冷轧过程中的织构演变。然而，通常使用的串联轧制促进了不期望的织构组分（例如γ-纤维）。因此，在第二阶段，将研究非常规轧制策略，如不对称轧制。这些轧制策略导致更高的剪切变形，这改善了冷轧织构。此外，在模拟研究中显示了热轧织构的强烈影响。例如，旋转立方体组件的大部分在冷轧期间保持不变。这种所需的织构组分可能与部分再结晶的热轧显微组织有关。因此，IBF使用的模型必须扩展到也考虑这些微观结构。最后，将使用扩展和链接模型来布局上述过程链。