Hot Rolling Twinning Behavior of Strip Casting Grain-Oriented Silicon Steel

doi:10.12068/j.issn.1005-3026.2022.02.005

Abstract

Abstract: In strip casting grain-oriented silicon steels， the inheritance of coarse λ grains (〈100〉//ND， normal direction) can deteriorate their magnetic properties. To solve the problem， twinning behaviors in strip casting grain-oriented silicon steels during hot rolling were investigated in this work. It is found that after rolling at 650℃， a number of 112〈111〉deformation twins are formed in the coarse solidification microstructure of the steels， in contrast to the well-accepted view that it is difficult to trigger twinning at relatively high temperature in the grain-oriented silicon steels with high stacking-fault energy. The results indicate that the complex stress state during hot rolling may weaken the orientation dependence of deformation twinning. Due to higher stored energy， the intersections of twin/twin boundaries and twin/grain boundaries can act as the preferential nucleation sites for the recrystallized grains during normalizing annealing， leading to a significant increase of recrystallization rate. Because of the restriction from local strain partitioning and the limited size between the twins， the shape of new-formed recrystallized grains is mainly plate-shaped. Consequently， the fine grains with scattered orientations are formed in the normalized microstructure and the coarse λ grains in the solidification microstructure are eliminated.

Key words: strip casting； grain-oriented silicon steel； twinning； microstructure； texture

CLC Number:

TG132.1

SONG Hong-yu， LIU Hai-tao， WANG Guo-dong. Hot Rolling Twinning Behavior of Strip Casting Grain-Oriented Silicon Steel[J]. Journal of Northeastern University(Natural Science), 2022, 43(2): 182-187.

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