摘要
Fe-3%Si电工钢铸锭中普遍存在柱状晶,其晶体学及形状各向异性对随后的热轧、冷轧及退火织构产生很大的影响.利用xRD与EBSD技术对长轴分别平行于轧面法向(ND),轧制方向(RD)和横向(TD)的柱状晶冷轧样品的织构及组织进行了研究,并对晶界的特殊作用进行了分析.结果表明,中等压下量下,3种柱状晶样品具有不同程度的{001}织构遗传性,即3种样品均不同程度的摆脱了{111}线织构的形成;柱状晶长轴平行于ND和TD时,{001}取向在冷轧时得到大的保留;柱状晶长轴平行于RD时,得到最强的{111}〈112〉织构;柱状晶长轴平行于TD时,冷轧组织中旋转立方织构及{111}〈110〉织构较强.此外,3种样品的织构均表现出由立方→{001}〈130〉→{113}〈251〉的过渡路径,与等轴多晶样品沿α线和γ线转动的路径不同.不同方向的柱状晶晶界对冷轧变形过程中晶粒转动的作用不同,但因晶粒尺寸大而作用有限,且与初始取向相关.
Columnar grains exist in nearly all cast slabs of Fe-3%Si electrical steels, their morphological and crystallographic anisotropies strongly influence the microstructure and texture evolution during following hot rolling, cold rolling and final annealing. This work investigates the rolling texture and microstructure of the specimens with columnar grains initially arranged along different directions by means of XRD and EBSD techniques, and the effects of columnar grain boundaries are analyzed. The results show that at intermediate rolling reduction, all three types of specimens show to different extents the inheritance of {001} texture, or in other words, they prevent effectively the formation of {111} texture. The {001} texture is strongly retained in ND specimen （with initial columnar grains＇ longitudinal axis being along normal direction） and TD specimen （with initial columnar grains＇ longitudinal axis being along transverse direction）, whereas {111}〈112〉 texture is the strongest in RD specimen（with initial columnar grains＇ longitudinal axis being along rolling direction）. In addition, rotated cube and {111}〈110〉 textures develop in TD specimen. All three types of specimens demonstrate an orientation rotation path from cube {001}〈100〉 over 20° rotated cube {001}〈130〉 to {113}〈251〉, which is in contrast to the conventional rotation path from a fiber to γ fiber in equiaxed polycrystalline electrical steels. In spite of the significant difference in grain boundary arrangement in the three types of specimens, their influence on texture formation is limited because of the large grain sizes and the influence is mainly related with initial orientations.To understand rolling texture evolution of columnar grain specimens is of great significance in the development of new type electrical steels with strong {001} texture.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第7期782-788,共7页
Acta Metallurgica Sinica
基金
国家自然科学基金资助项目51071024~~
关键词
电工钢
柱状晶
织构
冷轧
electrical steel, columnar grain, texture,cold rolling
