【摘要】 以无取向电工钢(NOES)极薄带为研究对象，采用电子背散射衍射(EBSD)技术系统研究了其在热轧、常化、一次冷轧、中间退火、二次冷轧及最终退火过程中的组织与织构演变规律。组织分析表明，热轧板和冷轧板的晶粒尺寸分布均近似服从参数为σ=1的瑞利分布，而常化板和退火板呈现等轴状的完全再结晶组织，其晶粒尺寸分布特征接近σ=3的瑞利分布。热轧板沿板厚方向组织呈不均匀性，表面区域主要由细长晶粒和小尺寸等轴晶粒组成，中心区域则为细长的变形晶粒。冷轧板沿厚度方向交替分布着深色晶粒和浅色光滑晶粒，其中深色晶粒中剪切带密集，并伴随较强的γ织构。织构分析表明，冷轧板以强α纤维织构和相对较弱的γ纤维织构为主，经退火后，材料演变为α~*纤维织构和γ纤维织构。冷轧过程促进了{111}面织构的形成，从而降低了整体织构因子，而退火过程则有利于{110}<001 >高斯织构的生成，抑制{111}<112 >和{111}<110 >织构，使织构因子升高，同时改善了有益织构与有害织构沿板宽方向的分布均匀性。更多还原

【Abstract】 Microstructure and textural evolution of an ultra-thin non-oriented electrical steel( NOES) strip during hot rolling,normalizing,first cold rolling,intermediate annealing,second cold rolling,and final annealing were systematically investigated using electron backscatter diffraction( EBSD). The microstructure analysis shows that the grain size distributions of the hot-rolled and cold-rolled sheets approximately follow a Rayleigh distribution with a parameter of σ = 1,whereas the normalized and annealed sheets exhibit fully recrystallized equiaxed microstructure with grain size distributions close to a Rayleigh distribution with σ = 3. The hot-rolled sheet exhibits microstructural inhomogeneity along the thickness direction,where the surface regions are mainly composed of elongated grains and small equiaxed grains,while the center region consists predominantly of elongated deformed grains. In the cold-rolled sheet,dark grains and light smooth grains are alternately distributed along the thickness direction,the dark grains contain dense shear bands and are associated with a pronounced γtexture. The texture analysis indicates that the cold-rolled sheet is characterized by strong α-fiber texture and relatively weak γ-fiber texture,while the annealing leads to the evolution of the texture into α~*fiber and γ-fiber components. Cold rolling promotes the formation of { 111}oriented textures,leading to a reduction in the overall texture factor,while annealing favors the development of the { 110 } < 001 > Goss texture and suppresses the { 111 } < 112 > and { 111 } < 110 > textures,resulting in increase in texture factor and improvement in the distribution uniformity of beneficial and harmful textures along the sheet width direction.更多还原