常化工艺对Si的质量分数为1.6%的无取向电工钢磁性能的影响  

Influence of Normalizing on Magnetic Properties for Non-Oriented Electrical Steel With Mass Fraction of Si of 1.6%

作　　者：匡元辉[1] 陈凌峰[1,2] 张晨[3] 罗文彬[1] 王现辉[1] 胡志远[1] 

机构地区：[1]首钢迁安钢铁有限责任公司,河北迁安064404 [2]北京科技大学材料科学与工程学院,北京100083 [3]钢铁研究总院连铸技术国家工程研究中心,北京100081

出　　处：《钢铁研究学报》2014年第9期41-47,共7页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(50934009)

摘　　要：研究了常化温度、常化时间及常化后冷却速度对Si的质量分数为1.6%的无取向电工钢成品磁性能的影响。结果表明：在850~1 050℃范围内,随着常化温度的升高,成品铁损先减小后增大,成品磁感应强度先增大后减小;当常化温度为1 000℃时,成品平均铁损最低,平均磁感应强度最高;常化时间从3min延长到7min时,成品铁损先减小后增大,成品磁感应强度则呈单调下降趋势;随着常化冷却速度的降低,成品铁损先减小后增大,成品磁感应强度则呈单调增大趋势;对于Si的质量分数为1.6%的无取向电工钢,最佳的常化制度为：在1 000℃进行常化,时间5min,常化后空冷。对热轧板进行常化后,热轧板发生了不同程度的再结晶和晶粒长大。提高常化温度、延长常化时间、降低冷却速度,都能使常化板晶粒粗化,进而粗化成品板晶粒,改善磁性能。通过扫描电镜观察发现,成品板中析出物主要为AlN和MnS的复合析出物,以及少量的单独析出的AlN和MnS,而常化工艺主要是通过粗化析出相,减少细小析出相数量,从而减少对晶界钉扎作用来改善成品磁性能。The effects of normalizing temperature,normalizing time and cooling rate after normalizing on magnetic properties of non-oriented electrical steel with mass fraction of Si of 1.6% were investigated.The results show that core loss of product decreases first and then increases,while magnetic induction increases first and then decreases with the increase of normalizing temperature from 850 to 1 050℃.Average core loss of product is the lowest and average magnetic induction is the highest when normalized at the temperature of 1 000℃.When normalizing time increases from 3to 7min,core loss of product decreases first and then increases,and magnetic induction monotonically decreases.With decrease of cooling rate after normalizing,core loss of product decreases first and then increases,and magnetic induction monotonically increases.The optimum normalizing parameters are normalizing temperature of 1 000℃,normalizing time of 5min and air cooling after normalizizing.After normalized,the hot rolled strip has different degrees of recrystallization and grain growth.Increase of normalizing temperature and normalizing time and decrease of cooling rate make the grains of normalized strip coarsen,which coarsens the normalized strip′s grains and improves magnetic properties.By scanning electron microscope,it is found that the precipitations of productions are mainly complex of AlN and MnS with a small amount of precipitated separately AlN and MnS.Normalizing improves magnetic properties of production mainly by coarsening the precipitated phase,then reducing the amount of fine precipitated phase and reducing the effect of pinning grain boundary.

关 键 词：常化 无取向电工钢 组织 析出相 

分 类 号：TG142.12[一般工业技术—材料科学与工程]