Effect of grain orientation in raw materials on texture of ultra-thin grain-oriented silicon steel
Considering the different microstructure and texture evolution laws for different oriented grains in raw material during cold rolling and annealing processes in the preparation of ultra-thin grain-oriented silicon steel,the deformation and recrystallization behaviors of three types of grains with different deviation from exact Goss orienta-tion was analyzed.It was found that,for Ⅰ-type(exact Goss)grains,sharp{111}<112> texture and abundant shear bands and deformation bands were formed during cold rolling,and a small amount of Goss oriented areas were observed in shear bands and deformation bands.During annealing,Goss oriented grains in shear bands and deforma-tion bands nucleated preferentially,with the majority existing in shear bands,then η-fiber texture peaked at Goss com-ponent and uniform structure with relative lower average grain size were obtained.For Ⅱ-type({0kl}<100>,k,l≠1)oriented grains,{111}<112> and{113}<361> textures were formed during cold rolling.There existed a small amount of η fiber areas in shear bands and deformation bands,while no shear bands were obtained in{113}<361> oriented regions.During annealing,η-fiber nucleation in shear bands and deformation bands occurred preferentially,and a large number of non-η fiber oriented nuclei presented an uneven distribution,then showed obvious growth advantage in following stage and thus obtained an uneven annealing structure with a lower proportion of η-fiber grains.The deformation and recrystallization behaviors of Ⅲ-type({011}<uvw>)grains were similar to that of Ⅰ-type grains,while a lower intensity of{111}<112> texture was obtained during cold rolling,and the recrystallization texture showed a diffuse distribution characteristic along η-fiber;During annealing,η-fiber orientated grains also nucleated preferentially mainly in shear bands and deformation bands.The nucleated non-η-fiber grains presented a uniform distribution,and not marked uneven annealed microstructure with a higher proportion of η-fiber grains and relative larger average grain size were achieved.By overall considering microstructure and texture,the raw material with lower proportion of Ⅱ-type grains and moderate proportion of Ⅲ-type grains can be used to prepare ultra-thin oriented-grain silicon steel.
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