ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
It has been actually required in recent years to decrease iron losses in transformer cores, as increment of electric energy consumption in all industries and homes. Answering to such requirements, Arai et al. developed a new type magnetic core material; it was tertiary recrystallized Si steel with 50 μm thickness, and it was of as low iron loss as an amorphous materials one. The Si steel was made by an annealing in a vacuum of 1×10−3 Pa and at a temperature of 1200 °C. In this study, we prepared samples for measurements from (110)[001] grain-oriented 3%Si steel with 300 μm thickness. We coldrolled them to about 50 μm using a four-high rolling mill, and then annealed in an atmosphere of highly pure Ar gas, from a point of view of saving energy. We investigated effects of annealing time, heating rate and gas flow rate on magnetic properties. The annealing temperature was fixed at 1000 °C. Hysteresis loops were drawn with single-sheet tester. Grain structure and its direction were decided by etch pit method. Coercive force Hc and induction B8 which is the induction at 800 A/m applied field were obtained from the hysteresis loops. The magnetic properties were somewhat changed according to the annealing condition. The coercive force varied from 5 to 30 A/m, and the induction varied from 1.45 to 1.85 T. The best properties, Hc was 5 A/m and B8 was 1.85 T, were obtained under the annealing condition; annealing time was 60 min, heating rate was 3 °C/s, and gas flow rate was 2 ι/min.The surfaces of the samples were not covered with tertiary recrystalline, but wholly with secondary recrystalline. About 90% grains were (110) plane, the rest was (100) plane. And about 90% [001] axes oriented to the rolling direction within five degree misorientation. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.361731
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