Study On Deformation And Recrystallization Texture In Heavily Rolled Nonoriented Silicon Steel

Non-oriented silicon steel is widely used as iron core materials of electric generators and motors, which is required to have excellent magnetic properties such as low core loss and high magnetic induction. The magnetic properties of non-oriented silicon steel are closely related to recrystallization texture. Thus, texture control can provide theoretical instruction for improving the magnetic properties of non-oriented silicon steel.In the present paper, effects of rolling reduction and intermediate recovery temperature on deformation and recrystallization textures were investigated by X-ray diffraction and electronic backscattered diffraction (EBSD) using Fe-2.1%Si steel as experimental material.The rolling deformation textures consist of a(<110>//RD) and γ(<111>//ND) fibers and exhibit marked through-thickness texture gradient in the reduction range from75%to95%. As reduction increases, the intensity of a fiber increases and that of{111}<112> in y fiber decreases while that of{111}<110> increases. The types and intensities of recrystallization textures are strongly influenced by rolling reduction. The primary recrystallization textures gradually transform from η fiber with intensity peak at{110}<001> at lower rolling reduction to y fiber with intensity peak at{111}<112> at higher rolling reduction. The evolution of recrystallization texture with different rolling reduction is mainly caused by variation of nucleation sites, which is dominated by shear band nucleation at rolling reduction between75%and85%and grain boundary nucleation at95%rolling reduction respectively.The deformation textures under different intermediate rocovery temperature are mainly composed of strong a and y fibers under95%rolling reduction. With the increase of recovery temperature, the intensity of a fiber weakens and that of{111}<112> and{111}<110> in y fiber increases and decreases respectively. Annealing temperature gives rise to significant influence on the recrystallization texture of95%rolling reduction. For low temperatur e annealing, the recrystallization texture of is made up of y fiber and{114}<481> under cold rolling and at intermediate recovery temperature of400℃. However, η fiber with intensity peak at {310}<001> is the major recrystallizatin texture with intermediate recovery temperature of600℃, and its intensity weakens from the surface to the quarter layer. Compared with low temperature annealing, the intensity of{114}<481> increases while γ fiber decreases under high temperature annealing(900℃for lmin). Based on the analysis of EBSD, the component{114}<481> is mainly nucleated at the grain boundary between a and a fiber. The nucleation rate of{114}<481> is relatively imporved by high temperature annealing, thus strengthens the{114}<481> of recrystallizatin texture.