柱状晶组织高硅电工钢二次再结晶的形成机理  

Formation of secondary recrystalliztion in columnar-grained high silicon electrical steel

作　　者：潘洪江 仇圣桃[2] PAN Hong-jiang;QIU Sheng-tao(Faculty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;National Engineering Research Center of Continuous Casting Technology,China Iron and Steel Research Institute Group,Beijing 100081,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]中国钢研科技集团有限公司连铸技术国家工程研究中心,北京100081

出　　处：《钢铁》2019年第5期47-53,共7页Iron and Steel

基　　金：国家重点研发计划资助项目(2016YFB0300305)

摘　　要：二次再结晶的发生会显著改变电工钢带材的组织和织构,进而影响其磁性能。以柱状晶组织高硅电工钢冷轧带材为研究对象,研究了不同退火方法对试样组织和织构的影响,明确了二次再结晶的发生条件、形成机理和控制方法。研究结果表明,柱状晶组织高硅电工钢冷轧试样发生二次再结晶的温度区间为850～1 000℃,在900℃退火可获得最大的晶粒尺寸。二次再结晶的形成是由于初次再结晶后试样的组织形成了织构抑制作用,小角度晶界抑制晶粒正常长大,大角度高能晶界迁移率高,具有大角度晶界的晶粒以取向长大方式发生二次再结晶。当退火温度高于1 000℃时,升温和冷却速率大于5℃/min可以有效抑制二次再结晶的发生。Secondary recrystallization would remarkably change the microstructure and texture of electrical steel,which further influenced its magnetic properties. The microstructure and texture of cold-rolled columnar-grained high silicon electrical steel were investigated by multiple annealing methods. The occurrence conditions,formation reason and control methods of secondary recrystallization were clarified. The results showed that the temperature of secondary recrystallization was ranged between 850~1 000 ℃. The maximum grain size was obtained in the sample annealed at 900 ℃.The reason for secondary recrystallization was determined to be texture inhibition of initial recrystallization. The normal grain growth was inhibited by low-angle grain boundaries,while the grains with high-angle grain boundaries occurred secondary recrystallization by oriented growth due to high energy(HE)and high grain boundary mobility. When the annealing temperature was higher than 1 000 ℃,the secondary recrystallization could be restrained by increasing heating and cooling rates higher than 5 ℃/min.

关 键 词：高硅电工钢 二次再结晶 退火 

分 类 号：TG142.1[一般工业技术—材料科学与工程]