Influence of deforming temperatures on the strain induced transformation in Q235 plain carbon steel

The influence of deforming temperature on ferrite transformation with the emphasis on the temperature range of above A(3) was followed in thermal simulating tests of Q235 plain carbon steel. Results reveal that ferrite could be induced by strain at higher temperature above A(3). At heavy strain no single state of deformed austenite was observed in this steel. As deforming temperature decreased, a transition of austenite dynamic recrystallization as dominant process to the concurrent process of austenite dynamic recrystallization and ferrite formation was detected and then strain induced ferrite transformation followed by ferrite dynamic recrystallization was observed. In plain carbon steel thermal mechanical processing should be characterized basically in microscale as dynamic combined transformation. Austenite dynamic recrystallization affected ferrite morphology, distribution and its refinement. Holding after deformation at above A(3) led to an inverse transformation of ferrite to austenite.