【摘要】 采用EBSD技术研究了某钢厂厚板坯流程试制的50W270高牌号无取向硅钢980℃常化过程中显微组织及织构的演变。结果表明:常化过程是热轧板再结晶及晶粒长大的过程,常化使组织均匀化,但厚度方向上始终存在织构梯度。常化过程中再结晶初期形核主要发生在s=0.5层中的{116}<110>变形晶粒上,新晶粒主要织构为{116}<110>~{001}<110>,再结晶后期形核主要发生在旋转立方织构变形晶粒上,与热轧板织构的区别是s=0.5层出现较强的高斯织构。再结晶形核阶段符合亚晶聚合机理,织构的演变可以解释为再结晶阶段的特殊取向的择优形核和晶粒长大阶段的特殊取向晶粒择优长大。更多还原

【Abstract】 Microstructure and texture evolution of a 50W270 non-oriented silicon steel which produced by thick slab casting process during hot band annealing( 980 ℃) were investigated by EBSD technique. The results show that the recrystallization and grain growth are observed during normalizing process,and the microstructure of the steel becomes homogeneous. All the time the texture gradients through the thickness are maintained. At the very early stage of normalization,recrystallization occurs mainly in deformed { 116} < 110 > grains at s = 0. 5 layer,the texture of new grains is mainly composed of { 116} < 110 >-{ 001} < 110 >,and mainly the nucleation takes place in rotate cube grains at the late stage of normalization. The essential difference in s = 0. 5 layer between hot band and normalized band is that strong Goss texture appear in normalized band. The recrystallization takes place through the mechanism of sub grain growth. And the formation of annealing texture can be attributed to the appropriate nucleation and grain growth.更多还原