| Non-oriented silicon steel is an kind of indispensable important soft magnetic material used in electric power,electron and military industry.It is mainly used for manufacturing all kinds of motor generator and transformer core and other electrical components.Ultra-thin non-oriented silicon steel are mainly used for military and scientific research traditionally.With the progress of frequency conversion technology and the development of new energy power,the ultra-thin non-oriented silicon steel which belonged to niche products has gradually become the emerging products.Improving magnetic induction intensity and cutting down the core loss have important practical significance for reducing energy consumption and saving energy.It mainly analyzed and discussed the influence of structure,magnetic properties,texture,precipitates and micro orientation by the different ratio,cold rolling deformations and recrystallization annealing process in this article.The main work and research results are as follows:(1)In order to study the influence of cold rolling deformation for non-oriented ultra-thin silicon steel strip's magnetic and texture,raw B35A300 non-oriented silicon steel strip materials was rolled to different thickness(0.06mm?0.26mm),then observed the changes of different cold rolling deformation microstructure after recrystallization annealing in 850? for 7min.With the increase of cold rolling deformation,the grain size was smaller and more homogeneous and the magnetic induction increases then decreases.The intensity of ? texture was the highest and the intensity of ? texture was low when thickness was 0.15mm,magnetic induction was the highest and it got 1.745T.With the reduce of thickness,iron losses of middle and high frequency was apparently decreased,on the middle and high frequency condition,the reduction of eddy current loss was greater than the increase of hysteresis loss,so the total iron loss was reduced.(2)Using 0.35mm B35A300 non-oriented silicon steel strip as raw materials in experiments,which was rolled to the target thickness of 0.08mm in the different values of velocity ratio(1.07?1.30).By testing the recrystallization texture and the magnetic measurement to analyze the influence of cross shear rolling deformation for non-oriented silicon steel strip's texture and magnetic results.With the increase of different velocity ratio,it is shown that shear zone gets increased in ultra-thin silicon steel strip microstructure and the intensity of ? texture was apparently reduced after recrystallization annealing,meanwhile,the intensity of Cube texture and Goss texture which are good for magnetic induction was increased,magnetic induction is gradually enhanced,magnetic induction was 1.706T when the values of velocity ratio got to 1.30.(3)In order to study the influence of annealing process for non-oriented ultra-thin silicon steel strip's magnetic and texture,taken different annealing process for 0.08mm target samples,then tested texture and magnetic properties,observed microstruture,analyzed precipitate and the micro grain orientation.With the increase of annealing temperature and time,grain size began to increase.When grain size got to 70?80?m,it was no longer changes with the continue rising of temperature,the grain was basically equiaxial crystal and produced single crystal,magnetic induction and iron loss was gradually decreased,the highest magnetic induction was 1.747T,the lowest iron loss P1.5/50 was 2.59W/kg?P 1.0/400 was 10.58W/kg?P1.0/1000 was 33.17W/kg.Iron loss was decreased with the increase of annealing time then no longer changed after annealing 10min,the lowest iron loss P1.5/50 was 2.60W/Kg?P1.0/400 was 11.03 W/kg?P1.0/1000 was 33.82W/kg.The research results showed that magnetic property was excellent by cross shear rolling which have an good application prospect. |
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