摘要:
为了弄清楚硫元素在无取向硅钢中的作用机理,结合工业化生产的0.25%Si硅钢,探讨了硫元素对钢的显微组织和电磁性能的影响。结果表明,钢中的硫含量从0.001 9%增加至0.010 2%时,试样的硫化物形貌、尺寸和数量发生了显著变化。硫化物形貌依次表现为“胶囊形”→“椭球形”→“类球形”,组成依次演变为“单个的MnS”→“复合的MnS+CuxS”→“单个的CuxS”。由于CuxS钉扎晶界和降低了晶粒长大扩散率,导致了0.010 2%S试样出现了“细晶偏聚”和“岛状晶粒”现象,最终引起晶粒尺寸偏小且非均匀分布。总的来说,0.010 2%S试样的磁感要优于0.001 9%S试样,但0.010 2%S试样的铁损要劣于0.001 9%S试样。两者铁损中的涡流损耗差值基本恒定,但磁滞损耗的差值会随着退火温度的升高而出现增大,这是造成0.010 2%S试样铁损偏高的主导因素。
Abstract:
Based on the industrial manufactured 0.25%Si non-oriented silicon steel sheets,the effect of sulfur concentration on microstructure and magnetic properties of the finished steel sheets was discussed,in order to find out the mechanism of sulfur element acting in non-oriented silicon steel sheets.The results show that when the sulfur concentration increases from 0.001 9% to 0.010 2%,there is a significant change of the morphology,size and number of the sulfides.The morphology of sulfide will change from capsular to ellipsoidal and then to spherical,and thus its type will change from the single MnS to the complex of MnS and CuxS,and then to single CuxS,respectively.The CuxS particles can pin the grain boundary and reduce the diffusion rate of grain growth effectively.Thus,fine grain segregation and island grain growth appear,which results in the heterogeneous distribution of fine grains.In a word,the magnetic induction of 0.010 2%S sample is superior to the 0.001 9%S sample,but the iron loss of which is inferior to the 0.001 9%S sample.Both of the difference value of eddy loss can keep steady,but the difference value of hysteresis loss will increase with the increasing of annealing temperature.This is the main factor causing the increase of total iron loss for 0.010 2%S sample.
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