Recrystallization Behavior and Texture Evolution in Low Carbon Steel during Hot Deformation in Austenite/Ferrite Region

Hot compression tests are carried out on low carbon steel with carbon content of 0.037 wt% over a temperature range of 900-700 degrees C. Stress-strain curves show that deformation resistance decreases from 870 to 820 degrees C and then increases. The temperatures of Ar-3 and Ar-1 are 873.8 and 796.4 degrees C, respectively, and the phase transformation speed reaches a maximum at 840 degrees C. The volume fractions of recrystallized grain, subgrain, and deformed grain are analyzed using optical microscope and electron back-scattering diffraction. The distributions and the proportions of misorientation angles are also calculated. Textures are described using the inverse pole figure (IPF) colored orientation maps and orientation distribution functions (ODF). The results show that dynamic recrystallization (DRX) of austenite occurs to varying degrees during deformation in the austenite and double-phase region. Dynamic recovery (DRV) of ferrite leads to the growth of ferrite grains in the double-phase region. DRX of ferrite by the subgrain coalescence occurs at 700 degrees C. The main deformation textures in most of the double-phase and single ferrite region are both cube texture. However, {112} component has the highest texture intensity at 750 degrees C, reaching 5. The evolution mechanism of microstructure and texture is also discussed.