Nucleation During Primary Recrystallization of RGO Electrical Steel Sheet Observed by the EBSP‐Method

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Abstract
RGO electrical steel with low power losses and high permeability to be used in power transformers obtains its superior magnetic properties by a sharp Goss-texture developed by secondary recrystallization. RGO is produced by a two stage cold rolling process with intermediate annealing and subsequent primary recrystallization. By ODF analysis a high Goss intensity after primary recrystallization was empirically proved to be advantageous for the development of a sharp final Goss-texture in the following secondary recrystallization. This, in turn, requires a better understanding of how to achieve the beneficial primary Goss-texture formed by the basic processes of nucleation and growth. In the present study the early state of recrystallization was investigated. Only the EBSP-method (electron back scattering pattern), recently developed by Dingley, provides a sufficient submicron spatial resolution to measure the orientations of the early nuclei together with their cold worked and recovered environment.

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