NDLI: Annealing conditions and high magnetic induction in thin-gauged 3% Si-Fe alloy strips

Content Provider	IEEE Xplore Digital Library
Author	Kim, S.B. Park, K.M. Cho, S.S. Lee, D.I. Heo, N.H.
Copyright Year	2005
Description	Author affiliation: Korea Electr. Power Res. Inst., Daejeon, South Korea (Kim, S.B.; Park, K.M.; Cho, S.S.; Lee, D.I.; Heo, N.H.)
Abstract	In this study, the optimal combination of heating rate and annealing atmosphere for obtaining high magnetic induction is suggested in 3% Si-Fe alloy strips containing 70 ppm bulk content of sulfur. Strips of 0.1 mm thickness are prepared through vacuum induction melting, hot and multi-stage cold-rolling processes. Between each cold rolling process, an intermediate annealing is performed at 800/spl deg/C for 20 min. In the high vacuum or flowing hydrogen of 5N purity, the strips are heated up to 1200 /spl deg/C with various heating rates. At 1200/spl deg/C, the strips are finally vacuum-annealed for 12 h. Results show that a trough in magnetic induction is observed in the case of vacuum annealing. Magnetic induction under hydrogen atmosphere decreased with increasing rate. From etch-pit observation, only the strip vacuum-annealed at 400/spl deg/C/h is composed of {100} + {111} texture and the other strips consisted only mostly of {110} grains. At 25/spl deg/C/h, a relatively high segregation profile is formed within the lower temperature range in comparison to that in the direct isothermal annealing. This condition results in the sluggish selective growth of {100} or {111} grains, due to strong grain boundary pinning effect of segregated sulfur within the lower temperature. The total number of {110} grains is found to be higher at higher heating and hydrogen flow rate. Such a difference in total number arises from the difference in selective growth kinetics of grains influenced by heating rate, hydrogen flow rate and the corresponding segregation concentration profile of sulfur.
Sponsorship	Magnetics Soc. of Japan Magnetics Soc. of the IEEE
Starting Page	1029
Ending Page	1030
File Size	222374
Page Count	2
File Format	PDF
ISBN	0780390091
DOI	10.1109/INTMAG.2005.1463943
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-04-04
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Annealing Strips Magnetosphere Hydrogen Heating Atmosphere Etching Temperature distribution Isothermal processes Grain boundaries
Content Type	Text
Resource Type	Article

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