Austenite Recrystallization and Controlled Rolling of Low Carbon Steels

摘要

The dynamic recrystallization and static recrystallizationin a lowcarbon steel were investigated throughsingle-pass and double-pass experi ments . The results indicate that as the deformation temperature increases andthe strain rate decreases ,the shape of the stress-strain curve is changed fromdynamic recovery shape to dynamicrecrystallization shape . The austenite could not recrystallize within a fewseconds after deformation at temperaturebelow900 ℃. According to the change in microstructure during deformation,the controlled rolling of lowcarbonsteel can be divided into four stages :dynamic recrystallization,dynamic recovery ,strain-induced ferrite transfor-mation ,and rolling in two-phase region. According to the microstructure after deformation,the controlled rollingof low carbon steel can be divided into five regions : non-recrystallized austenite , partly-recrystallized austenite ,fully-recrystallized austenite ,austenite to ferrite transformation,and dual phase .