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将1 mm 6.5wt%高硅电工钢复合板在450~650℃范围内进行中温轧制。通过光学显微镜观察了温轧后和不同热处理工艺处理后复合板的显微组织;测试了温轧0.5 mm复合板不同状态的磁感应强度和铁损,通过显微硬度测试确定了硅元素均匀化的情况。研究表明,中温变形后的复合板塑性差、裂纹多、硬度高、磁性能差;退火工艺不能消除复合板高硅层的裂纹,对其磁性能没有本质提高;合适的扩散退火工艺可以消除中温变形中芯层出现的裂纹、降低复合板芯层的硬度、大幅度提高磁性能。
The 1 mm 6.5wt% high silicon electrical steel composite plate in the temperature range of 450 ~ 650 ℃ for medium temperature rolling. The microstructures of the composite plate after hot rolling and different heat treatment processes were observed by optical microscope. The magnetic induction and iron loss of different states of 0.5 mm warm rolled plate were tested. The homogeneity of the silicon element was determined by the microhardness test Happening. The results show that the composite plate after medium temperature deformation has poor plasticity, many cracks, high hardness and poor magnetic properties. The annealing process can not eliminate the crack of the high silicon layer in the composite plate, and has no essential improvement on the magnetic properties. The suitable diffusion annealing process can eliminate the intermediate temperature Deformation of the core cracks appear to reduce the hardness of composite core layer, greatly improve the magnetic properties.