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Evolution of Optimum Grain Size for Low Loss Ferritic FeSi Steels
Author(s) -
Schneider Jürgen,
Stöcker Anett,
Kawalla Rudolf,
Franke Armin
Publication year - 2017
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201700201
Subject(s) - misorientation , materials science , microstructure , grain size , electron backscatter diffraction , recrystallization (geology) , metallurgy , annealing (glass) , grain growth , electrical steel , grain boundary , paleontology , biology
The magnetic properties of non‐oriented Fe–Si electrical steels are characterized by their magnetization behavior and specific magnetic losses. The magnetic losses are the most important property for selection of material grades at a given application. The magnetic properties are determined generally by the texture and microstructure. There is a strong link between the specific magnetic losses of the fully processed electrical steel and the grain size. Large values of grain size are necessary to reach low values of the specific magnetic losses. This is in contrast to conventional steels with high strength, where low values of grain size are preferable. To fulfill the requirements on large grain size for low loss materials grain growth plays an important role. In this paper, the authors will analyze by optical microscopy and EBSD investigations the influences of different microstructure of the hot strip and the resulting microstructure after cold rolling on recrystallization and grain growth after final annealing of Fe–2.4 wt% Si. The image quality plus rotation angle map and the misorientation angle frequency are used to access the degree of microstructural changes during processing. It will be demonstrated that the microstructure of the used hot band effects remarkable the onset of grain growth.