Abstract
High-temperature plane-strain compression tests were performed on Fe-3.0 wt.% Si alloy from 900 °C to 1150 °C at strain rates of 5 s−1 to 1 s−1, and the texture development from different initial textures was investigated by means of electron backscattered diffraction. Dynamic recrystallization occurs by strain-induced boundary migration, and the evolutions of the microstructure and different texture components vary with the initial texture. The critical orientation boundary separating the weakened and enhanced texture components moves with the initial texture, and a quantitative relationship is established to represent the dependence of the critical Taylor factor on the instantaneous texture. A model is proposed to describe the dynamic recrystallization texture by incorporating the oriented nucleation probability with a variable critical Taylor factor. The present work could improve the accuracy of hot deformation texture prediction based on strain-induced boundary migration.
Highlights
Texture in Fe-3.0 Wt.% Si Alloy.The hot deformation texture exerts a significant influence on subsequent textural development through cold deformation and annealing processes
In order to obtain Fe-3.0 wt.% Si specimens with the same average grain size but different initial textures, the sheets were annealed at 1150 ◦ C × 10~25 min
Dynamic recrystallization occurs during the high-temperature plane-strain compression of Fe-3.0 wt.% Si alloy by strain-induced boundary migration
Summary
The hot deformation texture exerts a significant influence on subsequent textural development through cold deformation and annealing processes. In the severe deformation of low- to medium-stacking fault energy (SFE) materials with a large stored strain energy gradient, DRX usually occurs by discontinuous dynamic recrystallization, where new dislocation-free grains nucleate from deformed grains and subsequently grow [3,4,5]. At a high deformation temperatures and low strain rate of medium- to high-SFE materials without a large stored strain energy gradient, DRX by continuous dynamic recrystallization (CDRX) and strain-induced boundary migration (SIBM) will take place, and the kinetic advantage determines the mechanism which plays the dominant role. CDRX is characterized by subgrain formation and growth, and the nucleation orientation may be low/high in stored strain energy [5,6,7]
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