Cr对含Nb高强无取向硅钢组织、织构及性能的影响

doi:10.13228/j.boyuan.issn0449-749x.20210708

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Abstract High strength non-oriented silicon steel is mainly used in high-speed motors, which requires good mechanical and magnetic properties. However, it is difficult for non-oriented silicon steel to obtain high strength and good magnetic properties at the same time. In this paper, the Cr-microalloyed Nb-containing high strength non-oriented silicon steel was designed and prepared. The effect of Cr on the microstructure, texture, mechanical properties and magnetic properties of Nb-containing high strength non-oriented silicon steel was studied by optical microscopy, EBSD, universal tensile testing machine, four-probe tester and magnetic properties test. The results show that the mass fraction addition of 0.5% Cr impedes the recovery of hot-rolled microstructure, and inhibits the recrystallization of normalized and final annealed microstructure. At the same time, the area fraction of favorable texture increases after normalization and annealing with the mass fraction addition of 0.5% Cr, while the area fraction of unfavorable texture decreases. Moreover, the mass fraction addition of 0.5% Cr increases the yield strength significantly and magnetic induction slightly of Nb-containing non-oriented silicon steel, but almost has no effect on the iron loss of the steel. The increase of yield strength of Nb-containing high strength non-oriented silicon steel after adding Cr is due to the solid solution strengthening effect of Cr, and the promotion of Nb precipitation by adding Cr and hence enhances the precipitation strengthening effect of Nb. The improvement of magnetic induction after adding Cr is owing to the promotion of favorable textures formation and the inhibition of unfavorable texture formation, which increases the texture factor. The resistivity of non-oriented silicon steel is increased after adding Cr, and hence decreases the iron loss. However, on the other hand, the promotion of Nb precipitation after adding Cr will increase iron loss by impeding the growth of crystal grains, and inhibiting the movement of magnetic domain. Thus, the mass fraction addition of 0.5% Cr will almost has no effect on iron loss of Nb-containing high strength non-oriented silicon steel as the co-effect of these two factors. Therefore, adding a small amount of Cr to the Nb-containing high strength non-oriented silicon steel will increase the strength and improve the comprehensive magnetic properties of steel due to the solid solution effect of Cr and its promotion of Nb precipitation.

Key words： high strength non-oriented silicon steel microstructure texture strength magnetic property

Received: 18 November 2021

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	Articles by authors
	CHENG Zhao-yang
	ZHONG Bo-lin
	JING Wen-qiang
	YU Yao
	SONG Xin-li
	LIU Jing

Cite this article:

CHENG Zhao-yang,ZHONG Bo-lin,JING Wen-qiang等. Effect of Cr on microstructure, texture and properties of Nb-containing high strength non-oriented silicon steel[J]. Iron and Steel, 2022, 57(5): 90-98.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210708 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I5/90

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