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

• Published in: Steel research international 2021-10, Vol.92 (10), p.n/a
• Main Authors: He, Guoning, Peng, Tianen, Jiang, Bo, Hu, Xuewen, Liu, Yazheng, Wu, Chunjing
• Format: Article
• Language: English
• Subjects: Austenite; Carbon content; Coalescing; Compression tests; Cube texture; Deformation resistance; Distribution functions; Dynamic recrystallization; electron back-scattering diffraction; Evolution; Ferrite; ferrite rolling; Hot pressing; Low carbon steel; Low carbon steels; Misalignment; Optical microscopes; Phase transitions; recrystallization; Stress-strain curves; textures
• ISSN: 1611-3683; 1869-344X
• DOI: 10.1002/srin.202100047

Hot compression tests are carried out on low carbon steel with carbon content of 0.037 wt% over a temperature range of 900–700 °C. Stress–strain curves show that deformation resistance decreases from 870 to 820 °C and then increases. The temperatures of Ar3 and Ar1 are 873.8 and 796.4 °C, respectively, and the phase transformation speed reaches a maximum at 840 °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 °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 °C, reaching 5. The evolution mechanism of microstructure and texture is also discussed. Dynamic recovery (DRV) of ferrite leads to the grain growth in the double‐phase region. Dynamic recrystallization (DRX) of ferrite occurs by the subgrain coalescence at 700 °C. The main deformation textures in most of the double‐phase and single ferrite region are cube texture. {112} component has the highest texture intensity at 750 °C, reaching 5.