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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。
The evolution of the microstructure and texture of the 50W270 high grade non-oriented silicon steel produced by a steel mill thick slab process at 980 ℃ during normalization was studied by EBSD technique. The results show that the normalization process is the process of recrystallization and grain growth of hot-rolled sheet. The normalization makes the microstructure even, but the texture gradient always exists in the thickness direction. The nucleation at the initial stage of recrystallization in the normalization took place mainly on {116} <110> deformed grains in s = 0.5. The main texture of the new grains was {116} <110> ~ {001} <110> The nucleation at the late stage of recrystallization mainly occurs on the deformed grains of the rotating cubic textured structure. The difference from the textured structure of the hot-rolled sheet is that there is a strong Gaussian texture in the s = 0.5 layer. The nucleation stage of recrystallization conforms to the mechanism of subgrain polymerization. The evolution of texture can be explained by the special orientation nuclei of the special orientation in the recrystallization stage and the grain growth of the special orientation grains at the grain growth stage.