摘要
将具有柱状晶组织的Fe-2.5Si-0.8Al硅钢铸坯进行了多道次热轧,利用EBSD技术研究表层动态再结晶区的形成规律及剪切织构特征,并确定细晶区内不同剪切取向的分布规律。结果表明,88%压下量下热轧板次表层形成了明显的水平带状动态再结晶细晶区,动态再结晶区被多种剪切取向形变晶粒包围。热轧时,次表层受到较大的剪切力使铜型织构更易出现,造成动态再结晶区内再结晶及附近形变的铜型织构组分均多于黄铜型和Goss剪切织构组分。过大的剪切作用不利于Goss织构的形成和保持,导致动态再结晶区内Goss织构组分的比例很少。黄铜型织构出现在动态再结晶区内及附近的比例相差不大,说明黄铜型织构的形成位置不受限制。在此基础上,将实验室热轧板与98.9%压下量的工业热轧板表层剪切织构进行对比,工业热轧板次表层至接近中心层(次表层与中心层之间位置)Goss织构组分最多。
The texture and microstructure varying between thicknesses of hot-rolled sheets can be inherited to the final recrystallized sheets in silicon steel and affect its magnetic properties.Deformed and dynamic recrystallized microstructures produced in the surface layers during hot rolling bring different shear textures.Based on the study of deformed shear textures in the surface layers of hot-rolled sheets,it is necessary to examine the shear textures in the dynamic recrystallization zone.The cast slabs of Fe-2.5Si-0.8Al silicon steels with columnar grains are hot rolled in multiple passes.This study investigates the formation of dynamic recrystallization zone and characteristics of shear texture using EBSD technique.Consequently,the distribution of different shear textures in the fine grain region is obtained.The results indicate that the dynamic recrystallization zone in the horizontal band appears in the subsurface layer;simultaneously,it is surrounded by deformed grains with different shear textures in hot-rolled sheets with 88%reduction.A Copper texture component easily appears in the sub-surface layer and becomes more than Goss and Brass texture components in dynamic recrystallization zone and the surrounding deformed matrix when subjected to heavy shearing.The Goss texture is weak in the dynamic recrystallization zone.This is because excessive shearing is harmful to the formation and retention of Goss texture.The proportion of Brass texture in the dynamic recrystallization zone is the same as that in the surrounding deformed matrix.Additionally,the shear textures of the laboratory hot-rolled sheets and the industrial hot-rolled sheets with 98.9%reduction are compared.In the industrial hot-rolled sheets,the Goss texture is most from the subsurface to the center layer(in the position between subsurface and center layers).
作者
姜伟宁
武晓龙
杨平
顾新福
解清阁
JIANG Weining;WU Xiaolong;YANG Ping;GU Xinfu;XIE Qingge(School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China;Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China)
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2022年第12期1545-1556,共12页
Acta Metallurgica Sinica
基金
国家自然科学基金项目No.51931002。
关键词
硅钢
柱状晶
剪切织构
动态再结晶
热轧
silicon steel
columnar grain
shear texture
dynamic recrystallization
hot rolling
