Dynamic Transformation Mechanism for Producing Ultrafine Grained Steels |
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| Authors: | Lijia Zhao Nokeun Park Yanzhong Tian Akinobu Shibata Nobuhiro Tsuji |
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| Affiliation: | 1. Department of Materials Science and Engineering, Kyoto University, Yoshida‐honmachi, Sakyo‐ku, Kyoto 606‐8501, Japan;2. Advanced Steel Processing and Products Research Center, Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO 80401, USA;3. School of Materials Science and Engineering, Yeungnam University, Gyeongsan 712‐749, Republic of Korea;4. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P.R. China;5. Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University, Yoshida‐honmachi, Sakyo‐ku, Kyoto, 606‐8501, Japan |
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| Abstract: | Ultrafine grained (UFG) steels with grain sizes around 1 micron exhibit an excellent strength‐ductility combination and have been extensively studied worldwide. Among the different grain refinement strategies, thermomechanical controlled processing (TMCP) employing dynamic transformation (DT), that is, ferrite transformation during deformation of austenite, is considered as the simplest and commercially exploitable approach to produce ultrafine ferrite (UFF) with grain size of a couple of microns or below. The present paper reviews the research history of DT and highlights the major aspects of continuous interest including the methods and evidences for identifying DT, thermodynamics and kinetics of DT, mechanism for UFF formation and the effects of some key thermomechanical parameters on DT (and UFF formation), together with an outlook for the future research, and new TMCP design for industrial application. This paper also discusses some areas remaining under debate such as the diffusional or displacive mechanism, thermodynamic modeling, and the mechanism for UFF formation, etc. |
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| Keywords: | Dynamic Recrystallization Dynamic Transformation Ferrite Grain Refinement Thermomechanical Controlled Processing Ultrafine Grained Steel |
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