The Evolution Of ?* Texture In Thin Gauge Non-oriented Electrical Steel And Its Effect On Magnetic Properties

Thin-gauge non-oriented electrical steel has many excellent characteristics such as high permeability,low iron loss from medium and high frequency and low magnetostriction.However,traditional processing and production require cold rolling and large reduction,and it is easy to form y texture after annealing,which deteriorates the magnetic properties of the final sheet.Therefore,this paper focus on XG300 hot-rolled sheet as the research object,and prepares thin-gauge non-oriented electrical steel by one-step cold rolling method based on the traditional process,abnd systematic study of the evolution law of ?*texture and its effect on the magnetic properties of the final sheets during the process from hot rolling,normalization to cold rolling and annealing.The morphology of electrical steel was characterized by Zeiss optical microscope and scanning electron microscope,and the micro-texture under different processes was analyzed with the help of EBSD.The main conclusions of the paper are as follows:(1)The XG300 commercial sheet obtained by hot rolling of continuous casting slab under high reduction(99%)can also formd strong {411}<148>recrystallized texture after long-term high temperature annealing,and the ? recrystallized texture was greatly suppressed in the normalized sheets.{411}<148>oriented grains form recrystallized grains by sub-crystal merging,and the{411}<148>texture formation mechanism were oriented growth.The nucleation position of{411}<148>oriented grains was mainly divided into nucleation at the grain boundary and nucleation inside the deformed grain.In the subsequent grain growth process,{411}<148>had a high mobility,nucleation advantage,quantity advantage,and size advantage to grew selectively,and eventually becames the dominant texture in the normalized sheet.(2)The {411}<148>oriented grains in the normalized sheet were preferentially activated in the two slip systems of {1-12}<-111>and {011}<-11-1>during the cold rolling deformation stage.The initial {411}<148>orientation transformed to {114}<110>and {311}<136>orientation.As the rolling reduction increased,the {311}<136>orientation transformed into a {112}<110>orientation.As the normalization time increased,the magnetic induction B50 first increases and then decreased.The increase in magnetic induction was attributed to the increase of {100<013>and {210}<001>texture and the weakening of {111}<112>texture.As the normalization time increased,on the one hand,the y texture in the final sheet was continuously weakened,and the average magnetocrystalline anisotropy decreases,thereby reduced the hysteresis loss;on the other hand,a relatively larger grain size within a certain range was beneficial reduce the hysteresis loss,resulted in a downward trend in the total iron loss in the final sheets.(3)The reduction rate had a significant effect on the texture and magnetic properties of the thin-gauge non-oriented electrical steel.As the reduction rate continues to increase,the ? and ?textures in the final sheet were gradually weakened,the y texture was decreased,and the{411}<148>texture is continuously increasing.The weakening of ? and ? textures leads to a decreased in magnetic induction,and the iron loss of the final sheet gradually decreased with the decrease in thickness;with the increase of annealing time,the {411}<148>texture is continuously strengthened,and finally becames the dominant texture.The {411}<148>texture in the sheet increases with the annealing time,and the B50 shows a downward trend.The iron loss also gradually decreases with the annealing time.In the early stage of recrystallization,{100(013>nucleated in {112}<110>,{111}<112>shear bands and {100}<011>-{112}<110>grain boundary.The{100(013>oriented grains have high grain boundary mobility on {100}<011>-{112}<110>deformed grains,and the {100<013>texture formation mechanism was oriented growth.