Nb微合金化Fe_(14)Si_2高硅钢温轧板织构演变规律

TEXTURE EVOLUTION OF Nb MICRO-ALLOYED Fe_(14)Si_2 HIGH SILICON STEEL DURING WARM ROLLING

采用Nb对Fe-6.5%Si(质量分数)高硅钢进行微合金化处理,结果表明:Nb在高硅钢薄板制备过程中细晶效果明显.铸态、锻态和热轧态组织的晶粒分别细化了17.50%,24.51%和30.13%.铸态样品压缩强度由1365 MPa提高至1520 MPa,延伸率提高77.78%;温轧板试样室温拉伸强度由573 MPa提高至621 MPa,延伸率提高44.44%.利用XRD对厚度为0.30—1.68 mm的温轧板的板面织构演变过程进行跟踪测量,结果发现:初始织构以(011)〈100〉Goss织构为主,单道次变形量为26.2%的情况下,Goss织构完全转化为(100)〈011〉旋转立方织构,随后,在单道次变形为22.6%的情况下,旋转立方织构完全转化为{111}面织构,即纤维织构,并稳定保持至0.30 mm.

Fe-6.5%Si （mass fraction） alloy possess perfect magnetic properties,though intermetallics of Fe14Si2 phase brought 6.5%Si leads to room temperature brittleness and hinder this significant materials industrialization. Nb was adopted into micro-alloying of Fe-6.5%Si high silicon steel. OM, thermal simulated test machine and XRD were employed to study the influence of Nb on high silicon steel in processing stages. Textures of warm-rolled high silicon steel strips were determined by XRD. The results indicate that Nb could refine the grains during fabrication of high silicon steel. Comparing to the non-Nb micro-alloyed high silicon steel, the grain size were reduced 17.50%, 24.51% and 30.13% in as-cast, forged and hot-rolled microstructure. Compression strength of as-cast specimen was enhanced from 1365 MPa to 1520 MPa with elongation rate from 0.225% to 0.400%. Tensile strength of warm-rolled strip was increased from 573 MPa to 621 MPa with elongation rate from 0.018% to 0.026%. XRD was carried out to indicate the surface texture evolution of warm-rolled high silicon steel with thickness from 0.30-1.68 mm during the warm rolling. The original （011）〈100〉 Goss texture totally transformed to （100）〉011〉 rotating cubetexture with single pass deformation of 26.2%. Then, rotating cube texture completely transformed to {111} fiber texture which remains until the thickness of 0.30 mm with single pass deformation of 22.6%.