| 中锰钢奥氏体逆相变的多相场模拟 |
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| 作者单位： | Steel Institute (IEHK), RWTH Aachen University, Intzestra?e 1, 52072 Aachen, Germany;Max-Planck-Institut für Eisenforschung GmbH (MPIE), Max-Planck-Stra?e 1, 40237 Düsseldorf, Germany;Steel Institute (IEHK), RWTH Aachen University, Intzestra?e 1, 52072 Aachen, Germany;Department of Ferrous Metallurgy, University of Science and Technology Beijing, Beijing 100083, China |
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| 基金项目： | Martin Etter at DESY is acknowledged for his support of acquiring HEXRD data;a member of the Helmholtz Association(HGF),which is gratefully acknowledged;The synchrotron high-energy X-ray diffraction measurements were carried out at the Powder Diffraction and Total Scattering Beamline P02.1 of PETRAⅢat DESY;Luo is thankful for the financial supports from the National Natural Science Foundation of China;The authors gratefully acknowledge the financial support of the Deutsche Forschungsgemeinschaft(DFG)within the Collaborative Research Center(SFB)761'Steel-ab initio:Quantum mechanics guided design of new Fe-based materials'and the project BL402/49-1.H;Bernd B?ttger at ACCESS e;is acknowledged for the helpful discussions |
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| 摘 要： | Medium-Mn steels have attracted immense attention for automotive applications owing to their outstanding combination of high strength and superior ductility. This steel class is generally characterized by an ultrafine-grained duplex microstructure consisting of ferrite and a large amount of austenite. Such a unique microstructure is processed by intercritical annealing, where austenite reversion occurs in a fine martensitic matrix. In the present study, austenite reversion in a medium-Mn alloy was simulated by the multiphase-field approach using the commercial software MICRESS? coupled with the thermodynamic database TCFE8 and the kinetic database MOBFE2. In particular, a faceted anisotropy model was incorporated to replicate the lamellar morphology of reversed austenite. The simulated microstructural morphology and phase transformation kinetics (indicated by the amount of phase) concurred well with experimental observations by scanning electron microscopy and in situ synchrotron high-energy X-ray diffraction, respectively.
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| 关 键 词： | ,,,,,,, |
Multiphase-field simulation of austenite reversion in medium-Mn steels |
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| Authors: | Yan Ma Rui Zheng Ziyuan Gao Ulrich Krupp Hai-wen Luo Wenwen Song Wolfgang Bleck |
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| Abstract: | Medium-Mn steels have attracted immense attention for automotive applications owing to their outstanding combination of high strength and superior ductility. This steel class is generally characterized by an ultrafine-grained duplex microstructure consisting of ferrite and a large amount of austenite. Such a unique microstructure is processed by intercritical annealing, where austenite reversion occurs in a fine martensitic matrix. In the present study, austenite reversion in a medium-Mn alloy was simulated by the multiphase-field approach using the commercial software MICRESS? coupled with the thermodynamic database TCFE8 and the kinetic database MOBFE2. In particular, a fa-ceted anisotropy model was incorporated to replicate the lamellar morphology of reversed austenite. The simulated microstructural morpho-logy and phase transformation kinetics (indicated by the amount of phase) concurred well with experimental observations by scanning electron microscopy and in situ synchrotron high-energy X-ray diffraction, respectively. |
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| Keywords: | medium-Mn steels intercritical annealing austenite reversion phase-field simulation faceted anisotropy model |
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