退火工艺对平整轧制后50W800无取向硅钢磁性能的影响

为提高50W800无取向硅钢的板形,需要对再结晶退火后的硅钢进行平整轧制,在平整后会出现硅钢片磁性能下降现象。对平整轧制后的50W800无取向硅钢进行400~800 ℃的去应力退火,利用单片测量法测量其铁损和磁感应强度,并用EBSD技术对组织织构进行分析。结果表明,经过平整轧制后,50W800无取向硅钢小角度晶界增加,但晶粒不均匀性会导致磁性能下降;采用700 ℃×2 min去应力退火后,50W800无取向硅钢磁性能得到较好的改善。EBSD技术分析发现,去应力退火能消耗大量小角度晶界,使晶界含量降低,晶粒均匀性增加,不利形变织构{111}<112>强度降低,这是50W800无取向硅钢磁性能改善的主要原因。

Effect of annealing process on magnetic properties of flattening rolled 50W800 non-oriented silicon steel

In order to improve the sheet shape of the 50W800 non-oriented silicon steel, the silicon steel after recrystallization annealing needs to be flattened, but the magnetic properties of the silicon steel sheet will decrease after flattening. The stress relief annealing test of the flattening rolled 50W800 non-oriented silicon steel was designed at 400-800 ℃, the iron loss and magnetic induction strength were measured by a single chip measuring method and the microstructure and texture were analyzed by EBSD technology. The results show that the small angle grain boundary of the 50W800 non-oriented silicon steel increases after flattening, but the nonuniformity of grain leads to the decrease of magnetic properties. It is found that after stress relief annealing at 700 ℃ for 2 min, the magnetic properties of 50W800 non-oriented silicon steel are improved. EBSD technology analysis shows that the stress relief annealing can consume a large amount of small angle grain boundary, reduce the grain boundary content, increase the grain uniformity, and reduce the strength of unfavorable deformation texture {111} <112>, which is the main reason for the improvement of magnetic properties of the 50W800 non-oriented silicon steel.