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采用金相显微镜和扫描电镜研究实验室模拟薄板坯连铸连轧(TSCR)工艺试制的高磁感取向硅钢(Hi-B钢)组织、织构的演变特征.研究发现实验室模拟薄板坯连铸连轧工艺试制的Hi-B钢热轧板显微组织及织构在厚度方向上存在不均匀性.常化板表面脱碳层铁素体晶粒明显粗化,常化板织构基本继承了热轧板相应的织构类型,仅织构强度不同.一次大压下率冷轧后,晶粒及其晶界沿轧向被拉长形成鲜明的纤维组织,织构主要为α纤维织构和γ纤维织构,脱碳退火后试样发生回复和再结晶现象并形成初次晶粒组织,脱碳退火后织构分布较为集中.温度升高至1000℃时二次再结晶开始,1010℃时钢中晶粒发生异常长大,高斯织构强度达到61.779.成品磁感为1.915 T,铁损为1.067 W·kg~(-1).
The microstructures and texture evolution of high-oriented oriented silicon steel (Hi-B steel) made by laboratory simulated thin slab continuous casting and rolling (TSCR) process were studied by means of optical microscope and scanning electron microscope. Casting and rolling process of Hi-B steel hot-rolled plate microstructure and texture in the thickness direction of the heterogeneity of the normalized plate surface decarburization ferrite grain coarse, coarse-grained plate texture Inherited the corresponding hot-rolled plate texture types, only different in texture strength.After a large reduction rate of cold-rolled, the grain and grain boundaries along the rolling direction is elongated to form a distinct fibrous structure, the texture is mainly α fiber Texture and γ fiber texture, after decarburization annealing sample recovery and recrystallization phenomenon and the formation of primary grain structure, decarburization annealing texture distribution is more concentrated.When the temperature rises to 1000 ℃ secondary recrystallization began, At 1010 ℃, the grains in the steel grow abnormally and the Gaussian texture strength reaches 61.779. The magnetic induction of the finished product is 1.915 T and the iron loss is 1.067 W · kg -1.