日本金属学会誌

J. Japan Inst. Metals, Vol. 59, No. 9 (1995),
pp. 917-924

Change of Magnetic Induction of Nitrided Fe-3%Si Alloyduring Secondary Recrystallization Annealing

Jirou Harase1, Fumio Kurosawa1, Yoshiyuki Ushigami1,Yasunari Yoshitomi2 and Syouzaburou Nakajima3

1Steel Research Laboratory, R & D Bureau, Nippon Steel Corporation, Futtsu
2Yawata Research Laboratory, Nippon Steel Corporation, Kitakyushu

3KyusyuKyouritu University, Kitakyushu

Abstract:

87.4% cold rolled and primary recrystallized Fe-3%Si specimens containing Al were nitrided after primary recrystallization. They were then annealed intermittently with the heating rate of 15°C/hr in a infrared radiation furnace in 100%N2 atmosphere. Magnetic induction B8 were measured after each annealing. The onset of secondary recrystallization was detected by the rapid rise of B8 value. The secondary recrystallization temperatures were higher when the initial grain sizes were larger or the nitrogen contents after nitriding treatment were higher. The secondary recrystallization with a sharp (110)[001] orientation took place at temperatures between 1070 and 1085°C in the specimens with different nitrogen contents and different initial grain sizes.
The existence of an optimum temperature range for the selective growth of the (110)[001] oriented grain in secondary recrystallization suggests that the {\varSigma}9 boundary becomes most mobile in the temperature range under the given inhibitor intensity.


(Received November 22, 1994)

Keywords:

primary recrystallization, secondary recrystallization, AlN, inhibitor, magnetic induction, core loss, grain boundary, coincidence boundary


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