Research Of The Deformation And Recrystallization Mechanisms Of The Ultra Thin Silicon Steel Strip Recrystallization Method

Ultra-thin oriented silicon steel strip has excellent magnetic properties under medium and high frequency conditions.It is mainly used to manufacture iron cores for high frequency transformers and pulse transformers.It is an important soft magnetic material that is indispensable in special fields such as electronics,aviation and military.In this paper,the finished oriented silicon steel sheet is used as the raw material to study the evolution of the microstructure and texture of the silicon steel ultra-thin strip during the cold rolling and recrystallization annealing process.The microstructure of the cold-rolled ribbon and the recrystallized structure after annealing were observed with the help of a metallurgical microscope.The texture composition and content of the cold-rolled sample were detected by X-ray diffractometer(XRD).)The orientation factor of cold-rolled samples and the recrystallization texture of ultra-thin silicon steel strips under different annealing processes were measured.The texture evolution and plastic deformation behavior during cold rolling are analyzed;the influence of annealing process parameters on the recrystallization texture and the recrystallization mechanism are analyzed.It is expected to provide certain experimental data and theoretical guidance for the preparation of ultra-thin oriented silicon steel strip by one-step recrystallization method.The orientation factor of the {112}<111> slip system in oriented silicon steel is greater than the {110}<111> slip system,and it is activated first.With the increase of cold rolling reduction,the content of Goss texture gradually decreases,the content of{212}<141> texture component first increases and then decreases,while the content of{111}<112> texture component gradually increases.The texture evolves in the order of{110}<001>?{212}<141>?{111}<112>.Twins appeared in the sample after cold rolling,and the crystal orientation was {001}<110>,which was derived from the{212}<141> texture component deformed by the {112}<111> twin system.During the cold rolling There is no change in twin orientation.After salt bath annealing,Goss grains preferentially nucleate.with the extension of the holding time,the Goss grains swallow the deformed matrix and the deformation twins gradually grow up.When annealed at 780?,the holding time is about 20 s for complete recrystallization;when annealing at 850?,the holding time is about 10 s for complete recrystallization,and finally a recrystallized texture dominated by Goss texture is formed.As the annealing temperature increases or the holding time increases,the average grain size increases.In the process of grain growth,due to the small-angle grain boundary suppression effect,the content of Goss texture in the annealed sheet increases first and then decreases,the magnetic induction intensity first increases and then decreases,and the iron loss first decreases and then increases.During the salt bath annealing,The content of Goss texture and ? line texture is the highest in the 780?/210 s process annealing board,the volume percentage is 76.9% and 93.1%.Best magnetic performance,B8 is 1.85 T and P1.7/50 is 2.64W/kg.