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Effect of Ball Scribing on Magnetic Shielding Efficiency of Grain-oriented Silico. steel

Journal of Iron and steel Research International 2014年第7期21卷 679-684页

作者： Hao WANG Chang-sheng LI Rui-bin MEI Gang HUO State Key Laboratory of rolling and Automation Northeastern University Northeastern University at Qinhuangdao Branch Northeastern University benxi steel posco cold strip rolling co. Ltd.

Magnetic shielding of grain-oriented silico. steel was investigated. Ball scribing with spacing of 2 to 16 mm was performed at peak flux densities of 8.0 mT to 1.3 T. Magnetic shielding efficiency was calculated, including absorption, reflection and inner multi-reflection shielding efficiencies. Magnetic shielding efficiency （MSE） increase ratios after different scribing spacing were co.pared, and thickness requirement to achieve absorption shielding of 50 dB was also calculated. The results show that magnetic shielding efficiencies of C711 and H668 silico. steels increase by 4.79 and 3.15 dB respectively after scribing of 16 mm. Before scribing, shielding efficiency of H668 steel was higher than that of C711 steel, while after scribing, both absorption and shielding efficiency gaps were largely abridged between C711 and H668 steels. Plate thickness of C711 steel co.ld be reduced from 3.18 mm without scribing to 2. 20 mm after scribing of 16 mm. There is no apparent thickness reduction at lower flux densities; while the peak flux density is above 0.3 T, the shielding effect beco.es apparent, and the thickness co.ld be reduced from 2.28 mm without scribing to 1.70 mm with scribing spacing of 16 ram. Magnetizing process and its effect on variation of magnetic shielding were also analyzed.

关键词： magnetic shielding efficiency grain-oriented silico. steel absorption shielding reflection shielding inner multi-reflection shielding thickness reduction

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Effect of Ball Scribing on Magnetic Barkhausen Noise of Grain-oriented Electrical steel

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Journal of Materials Science & Technology 2013年第7期29卷 673-677页

作者： Hao Wang Changsheng Li Tao Zhu Ban Cai Gang Huo Nasir Mohamed State Key Laboratory of rolling and Automation Northeastern University Wolfson Centre for Magnetics Cardiff UniversityCardiff CF24 3AAUK benxi steel posco cold strip rolling co.Ltd

Effect of ball scribing on magnetic Barkhausen noise （MBN） of co.ventional grain-oriented （CGO） and high- permeability grain-oriented （HGO） electrical steel was investigated. The results showed that after ball scribing, root mean square of MBN （MBNrms） of CGO electrical steel increased 9.8% with 4 mm scribing spacing at 1.2 T, and that of HGO electrical steel apparently decreased 17.3% with 16 mm scribing spacing at 1.2 T. Through the formation and development of free magnetic poles and seco.dary magnetic domains due to co.pressive stress, primary magnetic domain space of grain-oriented electrical steel beco.es smaller, which reflects as a variation of MBN in the macrosco.ic magnetic properties. Through co.relation formula derivation of MBNrms and equilibrium distance between domain walls, effect of domain refinement on grain-oriented electrical steel was also interpreted, and optimum equilibrium distance between domain walls was determined.

关键词： Ball scribing Grain-oriented electrical steel Magnetic Barkhausen noise Domain refinement

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