退火温度对超薄取向硅钢织构及磁性能的影响

Effect of recrystallization annealing temperature on texture and magnetic properties of ultra-thin oriented-silicon steel

为了研究中/高频用超薄取向硅钢制备工艺中退火温度对组织、织构及磁性能的影响,以商用0.27mm规格无底层取向硅钢成品板为原料采用初次再结晶法制备了0.08mm厚的超薄取向硅钢。系统研究了800~1000℃温度范围内退火对超薄取向硅钢退火组织、织构及磁性能的影响。结果表明,过渡带中的η取向({0kl}<100>)与相邻形变基体呈大角度取向差晶界,再结晶开始时,η取向组分优先在过渡带边界"弓出"形核;随着退火温度升高,再结晶平均晶粒尺寸增大,{114}<481>等非η取向晶粒尺寸优势愈发明显,η组分体积占比降低,晶粒尺寸均匀性变差;稍低温退火时超薄取向硅钢综合磁性能较好,退火温度为800℃时,磁感应强度B800=1.82T,铁损P(1.5/400)=11.66W/kg,获得本试验条件下最佳综合中频磁性能。

In order to study the effect of annealing temperature on microstructure,texture and magnetic properties of ultra-thin grain-oriented silicon steel for medium/high frequency application,an ultra-thin grain-oriented silicon steel with a thickness of 0.08 mm was prepared by the primary recrystallization method using the commercial 0.27 mm glassless grain-oriented silicon steel plate as raw materials.Effects of annealing in the range of 800℃to 1000℃on annealed structure,texture and magnetic properties of ultra-thin oriented silicon steel were systematically investigated.It was found that,due to forming high-angle misorientation grain boundary with surrounding deformation matrix,theηoriented({0kl}<100>)grains in transition bands preferentially nucleated by bulging of initial grain boundaries.With the increase of annealing temperature,average recrystallized grain size increased,the size advantage of non-ηoriented grains such as{114}<481>grains became more obvious,the volume ratio ofηoriented grains decreased and grain uniformity turned worse.Ultra-thin oriented silicon steel had better comprehensive magnetic properties when annealing temperature was slightly lower and the magnetic induction intensity and the core loss was 1.82 Tand 11.66 W/kg respectively,best comprehensive medium frequency magnetic properties in the present experiment condition when annealing temperature was 800℃.