冷轧压下率对高强无取向电工钢变形组织和磁性能的影响

Effect of cold rolling reduction rate on deformation microstructure and magnetic properties of high strength non-oriented electrical steel

借助场发射扫描电镜(SEM+EBSD)、快速升温管式炉和交流磁性能测量仪研究高强无取向电工钢冷轧变形组织和磁性能随冷轧压下率的变化规律。结果表明:冷轧高强无取向电工钢中形成含有大量亚结构的粗糙条带和变形量较小的光滑条带。粗糙条带具有γ取向,主要为{111}〈110〉,光滑条带具有{112}〈110〉和{001}〈110〉取向。粗糙条带中存在大量宽度约为2~3μm的剪切带,与轧向呈20°~35°夹角,且随压下率增大,数量逐渐增多。剪切带与基体间具有一定取向差,随压下率增大,剪切带逐渐从{111}〈110〉取向转向{223}〈110〉取向,与基体间取向差逐渐增大。退火后Goss和{111}面织构增多,{001}面织构减少;轧向磁感应强度增大,横向磁感应强度减小,各向异性显著,铁损下降。

The variation rule of deformation structure and magnetic properties of high strength non-oriented electrical steel with cold rolling were studied by field emission scanning electron microscopy(SEM+EBSD),rapid temperature tube furnace and AC magnetic properties measuring instrument.The results show that the rough strips with a large number of substructures and smooth strips with a small amount of deformation are formed in cold-rolled high strength non-oriented electrical steel.The rough strip has aγorientation,mainly{111}〈110〉,and the smooth strip has a{112}〈110〉and{001}〈110〉orientation.In the rough strips,there are a lot of shear bands with width of about 2-3μm,which show an angle of 20°-35°to the rolling direction.And the quantity increases gradually with the increase of the reduction rate.There is a certain misorientation between the shear band and the matrix.With the increase of the reduction rate,the shear band gradually changes from{111}〈110〉to{223}〈110〉,and the misorientation between the shear band and the matrix gradually increases.After annealing,the texture of Goss and{111}increases,while the texture of{001}decreases.The rolling direction magnetic induction intensity increases,the transverse magnetic induction intensity decreases,the magnetic anisotropy is significant,and the iron loss decreases.