Landolt-Börnstein - Group III Condensed Matter Processing and microstructure


This chapter deals with the processing and microstructure of grain-oriented (GO) silicon steel. The conventional grain-oriented (CGO) laminations and processes for three different types of high permeability (HGO) steels are tabulated. The HGO steels basically differ for the type of grain growth inhibitors, for the cold-rolling sequence and the annealing temperatures. CGO and HGO-1 processes adopt a two-stage cold reduction, with intermediate annealing, while HGO-2 and HGO-3 steels are reduced to the final thickness in a single step. Growth inhibition of the primary recrystallized grains is obtained by MnS precipitates in the CGO process. Pole figures optically determined through the etch pit method, showing the crystal orientation of high-permeability is figured out. Microstructure and principal texture components observed at surface and center layers of the lamination in correspondence of different processing stages for conventional grain-oriented (CGO) silicon steels are shown. Fraction of γ-phase present in Fe-Si at high temperature, solubility of MnS and AIN in Fe-Si are illustrated. HGO-3 processed silicon steel is shown and GO silicon steel and its orientation distribution function (ODF) after primary recrystallization, two-stage cold rolling and decarburizing process are figured out. Normalized grain size distribution after decarburization and primary recrystallization of CGO silicon steel, and decarburization in HGO-2 processed silicon steel are also figured out.

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Title Processing and microstructure
Book Title
Magnetic Alloys for Technical Applications. Soft Magnetic Alloys, Invar and Elinvar Alloys
In Grain-oriented 3 wt % silicon steels
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Chapter DOI
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Landolt-Börnstein - Group III Condensed Matter
  • H. P. J. Wijn
  • Authors
  • G. Bertotti
  • F. Fiorillo
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