50W1300无取向硅钢的显微组织和织构演变

Evolution of Microstructure and Texture of 50W1300 Non-oriented Silicon Steels

运用金相观察和电子背散射衍射技术,研究了实际生产条件下50W1300无取向硅钢在热连轧—冷轧—退火过程中显微组织和织构的演变。结果表明,在热塑性加工过程中,热轧板表层均为等轴晶,芯部为变形压扁组织。经冷轧后,热轧组织转变为扁平的带状组织,芯部呈现纤维组织特征。退火组织为晶界清晰且较规整的等轴铁素体晶粒。沿厚度方向,热轧板织构类型不同。冷轧板织构类型基本不变,主要为α织构、γ织构和旋转立方织构{100}<110>;在板厚1/4处,α织构和旋转立方织构强度达到最高,γ织构显著减弱。退火板中γ织构强度有所降低。

The effect of hot continuous rolling-cold rolling-annealing process on microstructure and texture of 50W1300 non-oriented silicon steel is investigated by the technology of EBSD and electron microscopy.The results show that during thermoplastic processing,all the grains in the surface layer of hot-rolled plates are equiaxed crystal and the grains in their cores are deformed flattened structure.The hot-rolled microstructure is transformed to flattened banded structure with characteristics of fibrous structure in the core after cold rolling.The annealed structure is composed of equiaxed ferrite grains with distinct and regular boundary.The texture distribution of hot rolled plates along the thickness are different while texture of cold rolled plate are basically the same,mainly consisting of α texture,γ texture and rotated cube texture of {100} .At the 1/4 thickness of the plate,the strength of α texture and rotated cube texture reaches the highest level while the strength of the γ texture decreases remarkably.The strength of γ-texture is weakened to some extent in the annealed plates.