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利用OM、TEM与EDS技术,对Fe-3.2%Si低温取向硅钢热轧板进行不同常化冷却工艺处理后的显微组织、析出相及最终产品的磁性能进行分析,并与热轧板的组织和析出相进行对比。结果表明,常化板较热轧板的表层组织均匀,基体中再结晶比例增加,带状组织变窄;常化板中析出物的数量明显比热轧板的多,析出物主要有AlN、MnS及复合析出的(Cu,Mn)S等。在常化温度1120℃、保温3 min的条件下,采用二段式冷却较空冷、淬沸水、淬常温水的冷却工艺,常化板表层显微组织更均匀,沿板厚方向的显微组织的不均匀性显著,取向硅钢的磁性能最高;常化后采用二段式冷却工艺析出的细小析出物数量最多,且弥散分布在基体中,抑制剂的抑制效果最好,对成品获得高磁性最有利。
The magnetic properties of the microstructure, precipitated phase and the final product of the Fe-3.2% Si low temperature oriented hot-rolled silicon steel sheet after different normalization cooling processes were analyzed by OM, TEM and EDS techniques. Tissue and precipitation compared. The results show that the surface of the normalized plate is more uniform than the hot-rolled plate, the recrystallization proportion increases in the matrix and the ribbon structure becomes narrower. The amount of precipitates in the normalized plate is obviously more than that in the hot-rolled plate. The precipitates mainly include AlN, MnS and composite precipitation (Cu, Mn) S and so on. Under the normalizing temperature of 1120 ℃ and holding time of 3 min, the cooling process of two-stage cooling is more effective than air cooling, quenching boiling water and quenching room temperature water. The microstructure of the surface of the normalized plate is more uniform and the microstructure along the plate thickness direction The silicon steel has the highest magnetic property. After the normalization, the number of fine precipitates precipitated by the two-stage cooling process is the largest, and the dispersion is distributed in the matrix, the inhibition effect of the inhibitor is the best, and the high magnetic The most favorable