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Vol.36, No.11, 1893 ~ 1899, 1998

Title

Joint - Syposium on Fine - Grained Materials by the Phase Transformation Committee ( Eighth ) and the Ferrous Metallurgy Committee ( Second ) : Grain Growth and Modeling ; Influence of the Secondary Recrystallization Temperature on the sharpness of Goss T

Jong Soo Woo , Chan Hee Han , Byung Deug Hong , Jirou Harase

Abstract

Nitrided Fe-3%Si alloys were secondary recrystallized by intermittent annealing without MgO coating (Model anneal)and by annealing with MgO coating(Box anneal). the optimum grain size and nitrogen content for the maximum B8 in both annealing methods were quite different. However, the maximum B8 obtained was the same(B8=1.94) in both annealing methods. The B8 after Model anneal was closely associated with the onset temperature of secondary recrystallization (T_(cr)). The maximum B8 was obtained when T_(cr) was about 1075℃ and T_(cr) increased with increasing initial grain size or initial nitrogen content. These findings were discussed utilizing recent information on the migration characteristics of Σ9 boundaries derived from an Fe-3% Si bicrystal. It was concluded that Σ9 boundaries determine the sharpness of Goss texture evolution and the future possibility of improving production technology of grain-oriented silicon steel was demonstrated based on this finding.

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