磁场预退火对取向硅钢二次再结晶组织及织构的影响

对二次冷轧后高温退火前3.2%Si取向硅钢在实验室自主设计研发的脉冲磁场预退火管式炉内进行不同温度的预退火处理,通过光学显微镜与XRD对其组织织构进行分析,利用硅钢片磁性能测试系统对高温退火后的试样进行磁性能分析。结果表明,经脉冲磁场预退火处理后,整体上取向硅钢平均晶粒尺寸随预退火温度升高略微减小,晶粒尺寸主要集中在10~25 μm范围内;通过ODF图及{200}极图分析可知,经脉冲磁场预退火后,最强织构随预退火温度的升高从{112}<110>织构变化到{223}<110>织构和{111}<110>织构;随着预退火温度的升高,高温退火后试样的磁性能反而降低。

Effect of magnetic field pre-annealing on secondary recrystallization structure and texture of oriented silicon steel

The 3.2%Si oriented silicon steel after secondary cold rolling but before high-temperature annealing was pre-annealed at different temperatures in a pulsed magnetic field pre-annealing tubular furnace independently designed and developed by the laboratory. The microstructure and texture were analyzed by optical microscope and XRD, and the magnetic properties of the specimen annealed at high temperature were analyzed by using the magnetic property test system for silicon steel sheet. The results show that on the whole, the average grain size of the oriented silicon steel decreases slightly with the increase of pre-annealing temperature, and the grain size is mainly in the range of 10-25 μm. According to the analysis of ODF diagram and {200} pole figure, after pulsed magnetic field pre-annealing, the strongest texture changes from {112}<110> texture to {223}<110> texture and {111}<110> texture with the increase of pre-annealing temperature, while the magnetic properties of the high temperature annealed specimen decrease.