Dresden 2020 – wissenschaftliches Programm
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MM 23.5: Vortrag
Dienstag, 17. März 2020, 12:45–13:00, IFW A
Interplay of grain boundaries, deformation and electromagnetic properties in iron silicon steel — •Martin Heller1, James Gibson1, Nora Leuning2, Kay Hameyer2, and Sandra Korte-Kerzel1 — 1Institute of Physical Metallurgy and Material Physics, RWTH Aachen — 2Institute of Electrical Machines, RWTH Aachen
Iron-silicon electrical steel sheet is the most widely used material for iron cores of electrical machines like generators, motors or transformers. Although already ubiquitous, the demand will nevertheless rise in the future since electro-mobility is spreading rapidly. The magnetic properties of the electrical steel sheet directly influence the application performance. Hysteresis losses result from the movement of domain walls. Even though electrical sheet steel is generally used in a fully recrystallized state, it is the final stages of production involving cutting that introduce large plastic strains, and hence high local dislocation densities. These have been shown to cause significant loss in performance, due to pinning of domain walls by dislocations. This study aims to learn more about the evolving dislocation structures at specific grain boundaries during deformation. Thus, single-crystalline micropillars (2*m x 4*m) are milled in two adjacent grains and their corresponding bi-crystalline counterparts on the grain boundary. After compression mechanical data, slip traces and crystal rotation are further analysed to study the interaction of dislocations on individual slip systems and the grain boundary. In a next step, grain orientations, grain boundaries and evolved dislocation structures will be correlated with electromagnetic properties on the macroscale.