Experimental investigation and simulation of crystallographic orientations evolution in a cold-rolled ultra-thin grain-oriented silicon steel

摘要

The evolutions of crystallographic orientations and textures of a cold-rolled ultra-thin grain-oriented silicon steel are studied via experimental investigation, texture simulation and orientation evolution calculation. The experimental results show that all components of η-fiber ({Ok1} <100> ) orientations in raw material demonstrate multi-directional crystal rotation routes during rolling and these initial orientations are retained as small regions distributed within the deformed matrix (mainly {111} <112> ), and the calculated typical transformation of orientations under the cold rolling condition is in good agreement with the experimental results. The crystal orientation of a grain would rotate to {111} <112> after rolling as long as its initial orientation is close to or slightly deviates from exact Goss ({011} <100> ). When the initial orientations deviates towards {021} <100>, the final deformed microstructures mainly turn into deviated γ-fiber or display {113} <361> orientations, meanwhile the orientation transition along η-fiber (rotating about <100> axis) during rolling is enhanced. Regarding the effect of surface shear on rolling plane towards rolling direction (RD) in ultra-thin steel production, it is suggested to strengthen {111} <112> deformation texture. While for different {Ok1} <100> components, the same surface shear exerts varied effect on the crystal rotation route, resulting in multiple orientation transition routes in deviated Goss and {021} <100> grains under cold-rolling process.