电工钢中柱状晶对热轧和退火时晶粒取向及组织的影响  

Influence of columnar grains on orientation and microstructure in electrical steel during hot rolling and annealing

作　　者：邵媛媛[1] 杨平[1] 李志超[1] 毛卫民[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《中国体视学与图像分析》2011年第2期141-146,共6页Chinese Journal of Stereology and Image Analysis

基　　金：国家自然科学基金(51071024)

摘　　要：利用EBSD技术研究了电工钢中长轴平行于轧向的柱状晶样品在热轧和退火过程中组织和取向的演变规律,并与长轴平行于板法向的样品的已有研究结果进行对比。结果表明,无论柱状晶按何种方向排列,只要表面存在剪切力,热轧后都可形成剪切织构,同时中心形成轧制织构,主要包括旋转立方织构和{112}<1-10>。柱状晶造成的影响主要体现在板中心层,长轴平行于轧向排列的样品热轧时形成的粗大旋转立方晶粒要到脱碳退火后才能完全消除,但破坏了正常的不同取向晶粒间的取向差分布及尺寸均匀性,导致二次再结晶不完全及磁性能降低。The evolution of microstructure and grain orientation in an electrical steel containing columnar grains with its long axis being parallel to the rolling direction of sheet was studied during hot rolling and annealing by EBSD technique.The results are compared with those of samples containing columnar grains being parallel to normal direction of sheet reported in the reference [3].It was shown that,whether the long axis of columnar grains was arranged in RD or ND,shear textures can be formed in the surface layer of the hot rolled sheet due to the shearing force.The rolling textures in the center layer are mainly rotated cube texture and {112}1-10 texture.The detrimental effect of columnar grains in the RD sample is mainly shown in the center layer of samples in way of coarse grains with rotated cube orientation in hot rolled or intermediately annealed samples until decarburizing annealing.This alters the misorientation distribution between primarily recrystallized grains,grain size distribution and inhibit particle distribution leading to an incomplete secondary recrystallization and reduction of magnetic properties.

关 键 词：电工钢 柱状晶 织构 热轧 退火 

分 类 号：TG142.15[一般工业技术—材料科学与工程]