Effect Of Cold Rolling On The Evolution Of Recrystallization Texture In Grain-oriented Silicon Steel

Grain-oriented silicon steel, used as core in various types of transformers, is the indispensable soft magnetic alloy in electronics, electricity military industry. Electrical steel products have usually been manufactured through many complicated steps, being honored as an "artistic product of iron" and representing the level of a country's manufacturing special steel. The key of manufacture is secondary recrystallization as the responsible process for development of the alone ? texture (<001>//RD) preferred orientation in grain-oriented electrical steel annealing at high tempreture. Small primary grain size, achieved through the inhibition of normal grain growth by second phase particles, is the general condition for secondary recrystallization. Inhibitors are usually added at the metallurgical process or formed in later nitriding treatment, leading to the complex manufacture process and high costs of oriented silicon steel.If the inhibitor can be not used in manufacture process of oriented silicon steel, the process will greatly simplify and the costs will be reduced. In this paper, the inhibitorless process was introduced into the oriented silicon steel produced, and strong ?(<001>//RD) orientation was achived in the secondary recrystallization texture of Fe-3% Si alloy by controlling the cold rolling parameters. The evolution of textures during the preparation and the effect of the cold rolling process on the recrystallization texture were investigated by X-Ray diffraction (XRD) methods and Electron Back Scattered Diffraction (EBSD). The obtained results show as follows:The cold rolling reduction has obvious effects on both primary recrystallization texture and secondary recrystallization texture in 3%Si grain-oriented silicon steel are remarkable influenced by cold rolling reduction ratio, but the different effect was result of the reduction ratio. As cold rolling reduction ratio increases, the intensities of Goss texture are decreased and the intensities of y texture are increased accordingly at the range from 70% to 95% in the stage of recrystallization, especially the strong Goss texture was formed in the whole plate when the eduction was 70%. For the secondary recrystallization texture, the intensities of Goss texture are appreciably decreased as the reduction ratio increases from 70% to 85%.The intensties of Goss along ? orientation fibers first increase then decrease with the variation of cold rolling temperature in recrystallization primary texture of 3% Si oriented silicon steel. The intensities of y fibers first decrease then increase with the variation of cold rolling temperature. The abnormal growth of Goss grains during the secondary recrystallization were achieved in the temperature range from 20? to 400?, and strong Goss texture were obtained eventually. The ? orientation fibers deviation angles are more small at rolling temperature of 400?.