Study On Microstructure, Texture And Properties Of 50W470 Non - Oriented Silicon Steel

Non-oriented electrical steel is mainly used in all kind of motor and engine core and some electrical parts, which is significant soft magnetic alloy apply in power, electrical and military industry.The research is based on ordinary 50W470 non-oriented electrical steel and high-manganese 50W470 non-oriented electrical steel produced by conventional production process (steel making-thick slab continuous casting-hot strip rolling). In the labortory cold rolled plate of high-manganese 50W470 non-orientied electrical steel was annealing, provide the theoretic guidance for the manufacture of high-manganese 50W470 non-orientied electrical steel.In this paper, based on same production process, microstructure and texture evolution of ordinary and high-manganese 50W470 non-orientied electrical steel were analyzed and summarized. Microstructure evolution:Surface microstructure of ordinary 50W470 hot rolled plate is The fine recrystallized grains,1/4 layer and 1/2 layer is mainly by deformation microstructure mixed with recrystallized grains. Surface microstructure of high-manganese 50W470 hot rolled plate is Fine recrystallized grains, the average grain size is larger than ordinary 50W470 hot rolled plate. High-manganese 50W470 hot rolled plate from the surface to the core is a large number of raecrystallized grain mixture with a few banded structure. Recrystallization ratio of high-manganese 50W470 hot rolled plate is higher than ordinary 50W470 hot rolled plate.The average grain size of ordinary 50W470 normalized plate is 87.9μm, the microstructure is more uniform, the average grain size of high-manganese 50W470 normalized plate is 73.3μm that is lower than ordinary 50W470 normalized plate, uniform of microstucture is poor.After 5 times of reversible cold rolling, Fibrosis degree of ordinary and high-manganese 50W470 cold rolled plate is low, no dense Fibrosis structure, don’t have obvious differece.The average grain size of ordinary 50W470 annealed sheet is 81.8μm, the average grain size of high-manganese 50W470 annealed sheet is 53.6μm which is obviously lower than ordinary 50W470 annealed sheet. Texture evolution:surface texture of ordinary and high-manganese 50W470 hot rollerd plate is mainly compose of{110} surface texture and{115}<552> oriented, have a small amount of Goss tecture.1/4 layer and 1/2 layer of ordinary and high-manganese 50W470 hot rolled plate is mainly compose of a fiber texture, y fiber texture and rotation cube texture, has weak{110} weak surface texture; After normaling processing, favorable {100}+{ 110} surface texture of 1/4 layer and 1/2 layer of ordinary and high-manganese 50W470 normaled plate has been enhauced, unfavorable{111} surface texture is significantly reduced; The texture of ordinary and high-manganese 50W470 cold rolled sheet is typical cold rolling textue, which isa fiber texture and y fiber texture; The texture of ordinary and high-manganese 50W470 annealed sheet is mainly compose of y fiber texture and{100} surface texture, both have weak Goss texture, Goss texture intensity of high-manganese 50W470 annealed sheet is high than ordinary 50W470.Annealing experiments on high manganese 50W470 cold rolled plate in the laboratory, Study on the magnetic properties and microstructure evolution. When annealing temperature is 980℃, magnetic properties of high-manganese 50W470 non-oriented electrical steel can achieve the best, average iron loss and average magnetic induction are respectively 3.07 W/kg and 1.709T, the corresponding optimum average grain size is 73.2μm. When annealing temperature is 980℃, magnetic indiction of high-manganese 50W470 non-oriented electrical steel can reach 1.737T at maximum.