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Constitutive Modeling of the Mechanical Properties of V-added Medium Manganese TRIP Steel

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Abstract

In this study, medium Mn transformation-induced plasticity steel with the composition Fe-0.08 pct C-6.15 pct Mn-1.5 pct Si-2.0 pct Al-0.08 pct V was investigated. After intercritical annealing at 1013 K (740 °C), the steel contained coarse-grained ferrite and two ultrafine-grained (UFG) phases: ferrite and retained austenite. The material did not deform by localized Lüders band propagation: it did not suffer from this major problem as most UFG steels do. Localization of plastic flow was shown to be suppressed because of a combination of factors, including a bimodal grain size distribution, a multiphase microstructure, the presence of nanosized vanadium carbide precipitates, and the occurrence of the deformation-induced martensitic transformation of retained austenite. A constitutive model incorporating these effects was developed. The model was used to identify the factors which can lead to a further improvement of the mechanical properties of the UFG medium Mn TRIP steels.

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Acknowledgments

This research was supported by the WCU (World Class University) program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (R32-10147 and R31-2008-000-10075-0).

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Authors and Affiliations

  1. Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang, 790-784, South Korea

    Seawoong Lee (Graduate Student) & Bruno C. De Cooman (Professor, Director)

  2. Center for Advanced Hybrid Materials, Department of Materials Engineering, Monash University, Clayton, VIC, 3800, Australia

    Yuri Estrin (Professor)

Authors
  1. Seawoong Lee
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  2. Yuri Estrin
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  3. Bruno C. De Cooman
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Correspondence to Bruno C. De Cooman.

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Manuscript submitted September 10, 2012.

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Lee, S., Estrin, Y. & De Cooman, B.C. Constitutive Modeling of the Mechanical Properties of V-added Medium Manganese TRIP Steel. Metall Mater Trans A 44, 3136–3146 (2013). https://doi.org/10.1007/s11661-013-1648-4

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