Affiliations: [a] EMCE, Vienna University of Technology, Vienna, Austria | [b] JFE Steel Corporation, Tokyo, Japan | [c] Gifu University, Yanagido, Gifu, Japan | Institute of Electrodynamics, Microwave and Circuit
Engineering, University of Technology, Vienna, Austria
Correspondence:
[*]
Corresponding author: Helmut Pfützner, Vienna University of
Technology, Inst. EMCE - Electrodynamics, Gusshausstr.27, 1040 Vienna, Austria.
Tel.: +43 664 3902 103; E-mail: pfutzner@tuwien.ac.at
Abstract: Domain analyses of modern types of grain-oriented (GO) transformer
steel are rare, and they are focussed on single grains under academic
magnetization patterns. The present Kerr effect study reveals that grains of
industrial, polycrystalline materials react in specific ways according to
individual crystallographic orientations. The amount of parameters is very
large, especially if additional flux components are given as a further impact.
The paper reports a procedure for statistical evaluations of quasi-dynamic Kerr
effect images. The instantaneous area ratios of bar domain portion BD, oblique
domain portion OD and saturation S are determined with consideration of peak
induction B_{RD} in the rolling direction (RD), axis ratio a
of rotational magnetization, the angle ψ between B and RD, additional flux
B_x in RD or B_z in normal direction.
Focus is put on OD(t) which is assumed to be a key function for λ (t),
i.e. the course of time of magnetostriction. As the most distinct tendencies,
OD increases strongly with increases of a and ψ. OD(t) shows non-sinusoidal
course of time with differences of the two halves of cycle. Rotation out of the
RD yields sharp onsets of ODs, especially after half-cycle saturation.
Additional off-plane flux enhances ODs in a general way.
Keywords: Magnetic domains, rotational magnetization, Kerr-effect, DC-bias, off-plane flux
