双辊薄带连铸1.2%Si无取向电工钢组织和析出物

Microstructure and Precipitates of 1.2%Si Non-oriented Electrical Steel in Twin-Roll Strip Cast Process

研究了双辊薄带连铸条件下,1.2%Si无取向电工钢初始组织和析出物形貌及分布规律.结果表明,在1 550℃浇注条件下,铸带经过空冷后以粗大的原始铸态铁素体组织为主,也有一部分相变产生的细小晶粒,晶粒尺寸范围为50~400μm.铸带中析出物为AlN和MnS,其中AlN析出分为高温析出和相变析出两种,高温析出AlN尺寸在0.5μm左右,相变析出AlN尺寸则在100 nm左右,二者对再结晶组织影响不大.MnS在铸带成型和成品退火过程中都有析出,尺寸范围为30~40nm.

The initial microstructure,the distribution and size of the precipitates in 1.2%Si non-oriented electrical steel strips were investigated under the twin-roll casting condition.The results revealed that the grain sizes range from 50 to 400 μm,including the original coarse casting grains and some fine grains formed by transformation in 1 550 ℃ pouring conditions.The precipitates of casting strip include AlN and MnS.Coarse AlN precipitates of 0.5 μm in size and a small amount AlN of 100 nm are also observed.Both have little effect on the growth of the recrystallized grain.MnS precipitates with a size ranging from 30 to 40 nm is observed in the strip and annealed samples.