On the Major Factors Affecting Goss Texture Development in Grain Oriented Silicon Steel

Abstract

Ever since Goss discovered the method of making ’grain-oriented’ silicon steel,l, a high number of explanations have been proposed. May and Turnbull2 showed that the second phase particles, particlarly MnS influence the mobility of the boundaries. Later Misra, Dfirman and Lficke3, as well as Inokuti4 found a strong correlation between the strength of the Gosscomponent measured in the subsurface of the hot band and that of the final product. Evidence was also given to indicate that the final Goss texture formation may also occur when the hot band subsurface contained no Goss at all5. Haratani and Hutchinson6, on the other hand, based on a series of sectioning experiments of silicon steel taken at various stages between primary recrystallization and subsequent abnormal grain growth, found that shear bands of {111}<112> orientation serve as nuclei for the Goss texture formation in the primary recrystallized specimen. Another series ofresearch by Harase and coworkers7 followed the idea ofAust and Rutter8, that boundaries with a high number of coincidence site lattice points migrate with a rate higher than others. First Harase et al.6 then Rouag et al.9 have observed that the formation of a well aligned Goss texture with little scatter, observed after abnormal grain growth, can be linked to the P.(9) type CSL boundaries in the primary recrystallized structure. For some time it was evident that it is not possible to accept several differring and contradictory explanations for the same final texture development, unless these theories are rather complementary then contradictory. We shall, in this paper, show that linking the hypotheses stated above can contribute to the understanding of the final texture development in GO silicon steel.