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Effect of Nb on primary recrystallization behavior of low temperature grain-oriented silicon steel |
WANG Li-guang, WANG Shu-huan, DUAN Yang-hui, LI Jie, FENG Yun-li |
College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China |
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Abstract In order to obtain the primary recrystallization structure conducive to the development of secondary recrystallization,the effect of Nb on the primary recrystallization behavior of low temperature grain-oriented silicon steel was studied,the effects of 0.055% Nb and Nb-free samples on the primary recrystallization structure,texture and grain boundary characteristics of intermediate annealed plate of low temperature grain-oriented silicon steel were studied by OM and EBSD techniques. The results show that the addition of Nb forms fine dispersed Nb (C,N) in the silicon steel matrix,enhances the inhibition of the inhibitor on the growth of primary recrystallized grains,makes the primary recrystallized microstructure of Nb-containing samples more fine and uniform,the average grain size in the surface direction is 11.53 μm,while the Nb-free sample is 12.95 μm. The average grain size in the thickness direction of the Nb-containing sample is 12.46 μm,while the Nb-free sample is 13.78 μm. After intermediate annealing,the surface texture of the Nb-containing sample and the Nb-free sample is relatively weak,but Nb-containing sample have more sharp γ-fiber texture. Two samples of subsurface layer γ-fiber texture and Goss texture are strengthened,and the Nb-containing sample γ-fiber texture is relatively stronger. The beneficial texture content of {111}<112>,{411}<148> is relatively high in the Nb-containing sample.The main grain boundaries in the primary recrystallized samples after intermediate annealing are high-energy grain boundaries and large angle grain boundaries. The high energy grain boundaries in the Nb-containing sample are more than Nb-free sample. The grain boundaries of Nb-containing and Nb-free samples are mainly distributed in Σ3-Σ11 Between grain boundaries,the addition of Nb can increase Σ9 grain boundary content. After the high temperature annealing,the secondary recrystallized microstructure of the Nb-containing sample is more complete than the Nb-free sample,and the final product has better magnetic properties,with B800 reaching 1.89 T and P1.7/50being 1.37 W/kg.
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Received: 06 July 2021
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