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On Phase Transformation Induced Effects Controlling the Flow Behavior of Ferritic-Martensitic Dual-Phase Steels

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Advances in Mechanics of Materials and Structural Analysis

Part of the book series: Advanced Structured Materials ((STRUCTMAT,volume 80))

Abstract

In the present work, peculiarities of the macroscopic, initial flow behavior of ferritic-martensitic dual-phase steels and their causes are discussed. For this purpose, results of continuum-micromechanical finite-element simulations on model microstructures are presented. During production of dual-phase steels, a portion of their microstructure, i.e. austenite transforms to martensite and thereby expands. This causes ‘transformation induced’ residual stresses and plastic strains in their microstructure. These quantities are identified to govern the initial flow behavior of these steels.

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Notes

  1. 1.

    The martensite-start-temperature is assumed to be \(400\,^{\circ }\text {C}\).

  2. 2.

    Deviatoric transformation strains are neglected here. Since each martensite grain most probably consists of several martensite variants, deviatoric strain of the grain most likely averages out.

  3. 3.

    This parameter represents a volumetric expansion (transformation strain) of \(1.23\%\), corresponding to the value used by Liedl [9, 11]. Another value representing an expansion of \(3.05\%\) delivers results qualitatively similar to those given in the present contribution [7].

  4. 4.

    As given in Eq. (3), the employed ferrite yields at room temperature at \(228\,\text {MPa}\). The unprestrained results in Fig. 4 show the yield point at approximately \(215\, \text {MPa}\). This little mismatch is induced by a numerical artifact (coarse solver step-size).

  5. 5.

    Except for small fluctuations due to the slightly differing Young’s moduli chosen for ferrite and martensite.

  6. 6.

    Unless the macroscopic load reduces the local von Mises stress.

References

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Acknowledgements

The authors express their appreciation to B. Regener, T. Taxer and R. Wesenjak. Several code scripts they shared contributed to the results presented. Y. Granbom of SSAB and A. Pichler of voestalpine generously provided industrial steel samples for model input and validation.

The Research Fund for Coal and Steel supported part of this work through grant RFSR-CT-2008-00027.

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Authors and Affiliations

  1. Institute of Materials Science and Mechanics of Materials, Technische Universität München, Boltzmannstraße 15, 85748, Garching, Germany

    A. Fillafer, E. Werner & C. Krempaszky

Authors
  1. A. Fillafer
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  2. E. Werner
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  3. C. Krempaszky
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Corresponding author

Correspondence to A. Fillafer .

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Editors and Affiliations

  1. Institute of Mechanics Faculty of Mechanical Engineering, Otto-von-Guericke-University Magdeburg, Magdeburg, Sachsen-Anhalt, Germany

    Holm Altenbach

  2. Fakultät 5, Abt. 1, Hochschule Bremen, Bremen, Bremen, Germany

    Frank Jablonski

  3. Institut für Mechanik, Technische Universität Berlin, Berlin, Germany

    Wolfgang H. Müller

  4. Institute of Mechanics, Faculty of Mechanical Engineering, Otto-von-Guericke-University Magdeburg, Magdeburg, Sachsen-Anhalt, Germany

    Konstantin Naumenko

  5. Institute for Lightweight Construction and Design (KLuB), Technische Universität Darmstadt, Darmstadt, Germany

    Patrick Schneider

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Fillafer, A., Werner, E., Krempaszky, C. (2018). On Phase Transformation Induced Effects Controlling the Flow Behavior of Ferritic-Martensitic Dual-Phase Steels. In: Altenbach, H., Jablonski, F., Müller, W., Naumenko, K., Schneider, P. (eds) Advances in Mechanics of Materials and Structural Analysis. Advanced Structured Materials, vol 80. Springer, Cham. https://doi.org/10.1007/978-3-319-70563-7_3

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  • DOI: https://doi.org/10.1007/978-3-319-70563-7_3

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