抄録
It has been tried to refine ferrite grain size due to ferrite recrystallization and ferrite transformation from deformed austenite applying large strain in (γ+α) dual-phase region. In this study, the microstructure before deformation was optimized for grain refinement. It is found that both low deformation temperature (750∿800℃) and relatively low α fraction are effective for grain size refinement in this process, then 1.1μm grained material was obtained by increasing carbon content for reducing α fraction and lowering deformation temperature.
