|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Deformation Induced Microstructural Modification
||Fabrication of Ultrafine Grained Ferritic Steels by Combining Dynamic Transformation and Dynamic Recrystallization
||Nobuhiro Tsuji, Lijia Zhao, Nokeun Park, Yanzhong Tian, Akinobu Shibata
|On-Site Speaker (Planned)
Ultrafine grained (UFG) steels having average grain sizes smaller than 1 micro-meter are known to show excellent mechanical properties. UFG microstructures in steels and other metallic materials can be realized by severe plastic deformation (SPD), but it is still difficult to apply SPD processed to large scale industries. On the other hand, we succeeded in making UFG ferritic microstructures in a 10Ni-0.1C steel by combining dynamic transformation (DT) from austenite to ferrite and dynamic recrystallization (DRX) of ferrite during thermo-mechanically controlled processing (TMCP) at elevated temperatures, Homogeneous ferrite microstructures with equaxed morphologies and sub-micrometer grain sizes could be obtained by the TMCP. The UFG specimen with the average grain size of 350 nm showed a yield strength of 953 MPa and total tensile elongation of 23%.
||Iron and Steel, Phase Transformations, Other