Project Details
Projekt
Approach to application-oriented properties of electrical steels by means of cold rolling and heat treatment
Applicant
Professor Dr.-Ing. Gerhard Hirt
Subject Area
Primary Shaping and Reshaping Technology, Additive Manufacturing
Term
from 2014 to 2022
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 218259799
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.
DFG Programme
Research Units
