Research On The Evolution Of Recrystallization Texture Of Grain-oriented Silicon Steel

As a magnetic alloy with excellent performance, Grain-oriented silicon steel is the indispensable soft magnetic alloy in electricity, electronics and military industry, it is mainly used for various types of transformer core. The characteristic of grain-oriented silicon steel is complex manufacturing process and equipment, strict composition control, low requirements impurity content, lengthy manufacturing process and many factors affect performance. Therefore, the product quality is not only often thought to be the measure of a country’s special steel manufacturing technology level of important symbol, but also grain-oriented silicon steel acquire the laudatory name of “art products”. Mostly, the grain-oriented silicon steel for commercial production achieve Goss texture. However what studied in the paper can achieve Cube texture. It performs high magnetic properties both in vertical and parallel directions. Thus, it is called double-oriented silicon steel. It plays an important role in the research of grain-oriented silicon steelCold rolling is the key process to connect hot rolling and recrystallization annealing and the secondary recrystallization process takes an important part on grain-oriented silicon steel to obtain high degree orientation of Cube texture. Therefore, it is necessary to explore and control deformation and recrystallization texture of grain-oriented silicon steel, and how to control the change of the microstructure of grain oriented silicon steel has an important significance for the formation of Cube texture during secondary recrystallization process. Using the ordinary silicon steel produced by An Steel Group Corporation for the study, and force on the changes of texture from hot rolling to the secondary recrystallization process through the technology of Electron Back-Scattering Diffraction and Transmission Electron Microscope to analysis how the cube texture formed and how the second phase particle affected. Through analysis of the observations, the conclusions are following;(1) Adopting the first parallel then vertical cold rolling, it achieves the cube texture oriented silicon steel whose thickness is 0.3mm.(2) From hot rolling to second cold rolling, the types of texture changed from {001}<110> to {111}<112>, and then become {111}<110>, after intermediate annealing, the type of texture become {001}<100>, during the recrystallization process, the type of texture becom Gamma fibers.(3) It produces a large number of deformation texture such as(001) during the second cold rolling, It produces enough energy for cube texture during recrystallization annealing. During high temperature annealing, as it has low surface energy for(100)[001] grain, it has priority to let cube texture grow up.(4) Through the analysis based on the cube texture and grain boundary character distribution, the grain boundary character distribution get more when the temperature rised. At the same time, the number of Σ 5 grain boundary decreaed, it explains the The Cube texture is not exist during the whole process. It gets strong Cube texture during the secondary recrystallization. It shows that the cube texture is not stable. Σ 5 has high migration rate. It can also find second phase particle around grain boundaries. It dissolves around the grain boundary when the cube texture forming. and it provides appropriate condition for cube texture abnormal growing up.