高磁感取向硅钢轧制及热处理过程中的晶界和织构演化

采用电子背散射衍射(EBSD)对不同轧制和热处理态的高磁感取向硅钢的重合位置点阵(CSL)晶界和织构进行了研究。结果表明,热轧态取向硅钢截面织构呈层状分布,表层主要为{110}<001>Goss织构,1/4厚度主要为{001}<110>立方织构、{112}<111>铜型织构和{110}<001>Goss织构,而心部则形成较强的{112}<111>铜型织构、{111}<110>形变织构和{110}<001>Goss织构;常化处理后截面织构梯度变化不明显,但中心位置{112}<111>织构向{110}<001>Goss织构转变。冷轧退火态主要织构为{110}<001>Goss织构、{112}<111>织构和{111}<110>形变织构。二次再结晶后,则生成强烈的{110}<001>Goss织构。随着织构的变化,CSL晶界也发生了明显的转变。热轧态CSL重位晶界中∑3~∑29均有出现,但比例较低;常化处理后CSL重位晶界比例增加,冷轧退火后CSL晶界比例大幅提高,特别是∑3、∑7、∑9和∑15等晶界;二次再结晶后,由于CSL晶界发生了转化,CSL晶界类型减少,∑3、∑13等晶界比例增加,∑9晶界消失。

Grain boundary and texture evolution of a high magnetic grain-oriented silicon steel during rolling and heat treatment

Coincident site lattice (CSL) boundary and texture of a high magnetic grain-oriented silicon steel in different rolled and heat treatment states were studied by means of electron backscatter diffraction (EBSD). The results show that the cross-section texture of hot-rolled oriented silicon steel is distributed in layers, the surface layer of which is mainly {110}<001> Goss texture, and the quarter of the thickness is mainly {001}<110> cubic texture, {112}<111> copper type texture and {110}<001> Goss texture, while the core forms strong {112}<111> copper type texture, {111}<110> deformation texture and {110}<001> Goss texture. After normalizing, the cross-sectional texture gradient is not obviously changed, but the {112}<111> texture at the center position changes to {110}<001> Goss texture. The texture components are {110}<001> Goss texture, {112}<111> texture and {111}<110> deformation texture in the cold rolled and annealed state steel. After secondary recrystallization, a strong {110}<001> Goss texture is produced. With the change of texture, the CSL grain boundary undergoes a significant transformation. ∑3-∑29 appear in the CSL boundaries in the hot-rolled state, with low proportions. The proportion of CSL grain boundary increases after normalizing. The proportion of CSL boundary increases greatly in the cold rolled and annealed state, especially ∑3, ∑7, ∑9 and ∑15 boundaries. Due to the transformation of CSL boundaries, the type of CSL boundary reduces during second recrystallization, while the proportions of ∑3, ∑13 and other grain boundaries increase, but the ∑9 grain boundary disappears.