STUDY ON MICROSTRUCTURE AND PRECIPITATES AT DIFFERENT NORMALIZING IN Fe-3.15%Si LOW TEMPERATURE ORIENTED SILICON STEEL

  • LI Hui ,
  • FENG Yunli ,
  • QI Xuejing ,
  • CANG Daqiang ,
  • LIANG Jinglong
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  • 1) School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083
    2) College of Metallurgy and Energy, Hebei United University, Tangshan 063009

Received date: 2012-10-29

  Revised date: 2013-02-06

  Online published: 2013-05-11

Abstract

The decreasing of slab heating temperature for grain-oriented silicon steel will reduce the amount of precipitates in hot rolled plate, and be disadvantage to the formation of ultimate Goss texture. The aim of normalizing is to control and adjust the amount, size and distribution of precipitates. Microstructures, precipitates and magnetic characteristics of finished products with different normalizing technologies for Fe-3.15%Si low temperature hot rolled grain-oriented silicon steel are researched, and the textures of cold rolled plates which are  original hot rolled plate and normalized plate are analyzed by means of OM, TEM, EDS and XRD, respectively. The results show that, normalizing technology with a temperature of 1120 ℃, holding 3 min, and a two-stage cooling is a most advantaged to obtain oriented silicon steel with sharper Goss texture and higher magnetic, owing to the uniform surface microstructures and the obvious inhomogeneity of microstructures along the thickness; the normalizing technology with two-stage cooling is the optimum process, which due to more finer precipitates are dispersively distributed in the matrix, and it is beneficial for finished products to get a higher magnetic; in these two processes, they obtain the same textures  which are mainly consist of {111}<110> and {111}<112>, however,comparing with the cold rolled textures without normalizing, the texturesdensity of γ orientation line on cold rolled plate which treated by normalizing are significantly increased.Therefore, it is confirmed that normalizing is helpful for grain--oriented silicon steel to get sharper Goss texture.

Cite this article

LI Hui , FENG Yunli , QI Xuejing , CANG Daqiang , LIANG Jinglong . STUDY ON MICROSTRUCTURE AND PRECIPITATES AT DIFFERENT NORMALIZING IN Fe-3.15%Si LOW TEMPERATURE ORIENTED SILICON STEEL[J]. Acta Metall Sin, 2013 , 49(5) : 562 -568 . DOI: 10.3724/SP.J.1037.2012.00644

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