Research Of Inhibitors And Primary Recrystall-ization Behavior In Grain-oriented Silicon Steel Based On CSP Technology

Oriented silicon steel is a kind of important ferrosilicon alloy soft magneticmaterials with {110}<110> texture (Goss orientation), which is applied to transformermanufacture. Through the reasonable ratio of melting composition, rigorous rollingreduction ratio and the second recrystallization annealing process, oriented silicon steelhas excellent performance of high magnetic induction and low loss.By the application of low temperature heating process, compact strip production(CSP) reduce the heating temperature of silicon steel and added inhibitor elements areevenly dispersed in the matrix material, which improve the magnetic properties oforiented silicon steel. Oriented silicon steel performance depends on the factors ofmaterial composition, inhibitor type, texture, grain boundary character types and gosstexture strength, the grain boundary characteristics of primary recrystallization haveimportant influence on the grain boundary characteristics of the second recrystallization.The researchers have done a lot of works about the production of hot rolling, cold rollingand primary recrystallization. However, the research about the first annealing time andthe second phase is very few.This paper takes the grain oriented silicon steel produced by CSP process as theresearch object and the hot rolled silicon steel have a process, which include normalizing,cold rolling and primary recrystallization annealing. This research change performanceof oriented silicon steel before and after the primary recrystallization annealing,including microstructure, macroscopic texture, microcosmic orientation and distributionof inhibitions and so on. At the same time, using the analysis method of physical andchemical experiments, the precipitates content of technological samples which arenormalizing samples before primary recrystallization annealing and primaryrecrystallization annealing samples of different process make determination and quantitative analysis. This study about primary recrystallization behavior on differentdecarburization annealing process has certain guiding significance.The results of the study show that: before the primary recrystallization annealing,there are obvious differences of normalizing grain size, the textures distribute random.There are more precipitations on the microstructure, and there are some differencesbetween the size of precipitation and precipitation distribution. At the same time, MnSand AlN precipitations precipitated by the micro alloy form. After primaryrecrystallization annealing, the grain refined, decarburizing annealing samples whichholding time is5minute in840℃have smaller primary recrystallization grain size,thecharacter of Grain boundary is ideal. Among them, high-energy grain boundary Σ3andΣ9enrich at grain boundaries around the favorable orientation, it is promoting theformation of favorable orientation. With prolonging annealing time, large angleboundaries and favorable orientation of declining numbers are not conducive to thenucleation and growth of Goss grain. After primary recrystallization annealing process ofdecarbonization, the overall precipitates are distributed in dispersion state. Thepercentage content of MnS and AlN precipitations in normalized plate and primaryrecrystallization annealing samples are constantly increasing.Under the different processof primary recrystallization, precipitated phase has the highest percentage with holding5minute.Compared with the corresponding precipitation morphology, the effect is obvious.