Study On Recrystallization Texture And High-frequency Magnetic Properties Of High Silicon Steel Thin Sheets

High silicon (Si, Al, Cr total content≥4.5%) has a high resistivity, low magnetocrystalline anisotropy and low magnetostriction characteristics. Therefore, it has three advantages of low iron loss, high permeability and low noise at high frequencies. According to three core issues of processing performance, texture control and high-frequency magnetic properties during the preparation of high silicon steel thin sheet, this paper carried out the research which the effect law of alloy composition and process parameters on the high silicon steel thin sheet primary recrystallization texture and high-frequency magnetic properties, as well as which the evolution law of high silicon steel secondary recrystallization microstructures and texture. The obtained results show as follows:Effect of composition on Fe-Si and Fe-Si-Cr high silicon steel recrystallization texture is significant:The effect of Si content is the most obvious. At Si content below3.5%,{111}<112> dominates recrystallization texture. At Si content above3.5%,{111}<112> and{114}<481> dominates recrystallization texture. And with the increasing of Si content,{114}<481> component has an increasing trend. When Si content is4.5%,{111}<112> has an increasing trend and{114}<481> has a first increasing and then decreasing trend with the increasing of Cr content.Effect of composition on high silicon steel high-frequency iron loss is significant at different frequencies:At frequency below1KHz, Fe-6.5%Si and Fe-6.0%Si-2.0%Cr thin sheet have obvious advantages to iron loss than other alloy thin sheets of less Si content. The iron loss of Fe-4.5%Si-(3.0-4.0)%Cr is gradually approaching to the iron loss of Fe-6.5%Si with the increasing of frequencies. At frequency above20KHz, Fe-4.5%Si-(3.0-4.0)%Cr can instead of Fe-6.5%Si in consideration of processing performance. Effect law of normalizing temperature, cold rolling reduction and annealing temperature on Fe-Si-Cr and Fe-6.5%Si thin sheet recrystallization texture is different. The effect of normalizing and annealing temperature on Fe-Si-Cr thin sheet grain size is less than Fe-6.5%Si, so the effect of normalizing and annealing temperature on Fe-Si-Cr thin sheet recrystallization texture is also less than Fe-6.5%Si. When cold rolling reduction is increasing from77%to86%, generally speaking, Fe-Si-Cr and Fe-6.5%Si thin sheet recrystallization texture show that η fibers texture decreases, y fibers texture increases and λ fibers texture remains basically changeless, but y fibers texture has a greater increasing trend in Fe-6.5%Si thin sheet.Suitable N content in the cold-rolled band coating can make secondary recrystallization of η orientation characteristic occurring during annealing in high silicon steel thin sheet. It can reduce the secondary recrystallization temperature if alloy composition contains C, because the addition of C reduces the average grain size of the primary recrystallization and it is benefit of secondary recrystallization occurring.