中文摘要：

采用弯曲实验,拉伸实验,SEM,TEM和EBSD等手段,研究了再结晶退火对高硅电工钢冷轧带材组织、有序结构、力学性能和冷轧成形性能的影响.结果表明,冷轧试样经800～1200℃保温1 h再结晶退火随炉缓冷后,室温塑性大幅下降,可弯曲角度均由冷轧试样的150°下降至50°左右,且二次冷轧出现严重的边裂;提高再结晶退火后的空冷或油淬温度、冷却速率可显著提高试样的室温塑性,1000℃保温1 h再结晶退火后,900℃油淬试样的可弯曲角度增大至175°左右,拉伸断后伸长率由随炉缓冷试样的0.2%提高至5.2%,且二次冷轧基本不出现边裂;提高再结晶退火后的冷却温度和速率显著提高试样的室温塑性的原因是试样的有序相尺寸明显减小,例如,有序相畴尺寸可从600℃以下油淬试样的约5μm分别减小至700℃油淬试样的小于50 nm和900℃油淬试样的小于25 nm.

英文摘要：

High silicon electrical steel （Fe-6.5%Si alloy, mass fraction） has excellent soft magnetic properties. However, the alloy is very brittle at room temperature and quite hard to be fabricated into cold-rolled sheet by conventional rolling process due to the existence of ordered phases. In recent years, high silicon electrical steel sheet has been successfully obtained though rolling process, and many studies have focused on the recrystallization of the alloy sheet in order to optimize the magnetic properties. Furthermore, it is necessary to further investigate the plasticity of recrystallized high silicon electrical steel sheet for improving the subsequent plastic deformation, such as coiling, uncoiling, blanking and secondary cold-rolling. In this study, effects of recrystaUization on the microstructure, ordering, mechanical properties and cold-roiling workability of cold-rolled high silicon electrical steel samples were investigated by using SEM, TEM, EBSD, bending test, tensile test and cold-rolling. The results show that when the cold-rolled samples were recrystallized at 800-1200 ℃ for 1 h followed by furnace-cooling, the plasticity of the sample is sharply decreased, which is proved by the decrease of bending angles from about 150° to 50°and the occurrence of serious edge cracks after secondary cold-rolling. The plasticity of the recrystallized sample is significantly improved by increasing both the cooling temperature and cooling rate during the recrystallization. When the cold-rolled samples were recrystallized at 1000 ℃ for 1 h followed by oil-quenching from 900 ℃, the bending angles are increased to about 175°, the average elongation to failure are increased from 0.2% of furnacecooling sample to 5.2%, and the secondary cold-rolling edge cracks are suppressed effectively. The plasticity improvement can be attributed to the refinement of ordered domain during recrystallizafion annealing with high cooling temperature and high cooling rate. For instance, the size of ordered domain in the sample b