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On Constitutive Models for the Momentum Transfer to Particles in Fluid-Dominated Two-Phase Flows Read chapter Read first chapter

2018 | OriginalPaper | Chapter

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

Authors : A. Fillafer, E. Werner, C. Krempaszky

Published in: Advances in Mechanics of Materials and Structural Analysis

Publisher: Springer International Publishing

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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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Footnotes
1
The martensite-start-temperature is assumed to be \(400\,^{\circ }\text {C}\).
 
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
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
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
Except for small fluctuations due to the slightly differing Young’s moduli chosen for ferrite and martensite.
 
6
Unless the macroscopic load reduces the local von Mises stress.
 
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Rashid, M.S.: GM 980X-A unique high strength sheet steel with superior formability, SAE Technical Paper 760206. Society of Automotive Engineers Inc., Warrendale, PA (1976)
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Fischmeister, H., Karlsson, B.: Plastizitätseigenschaften grob-zweiphasiger werkstoffe. Zeitschrift für Metallkunde 68, 311–327 (1977)
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Davies, R.G.: Influence of martensite composition and content on the properties of dual phase steels. Metall. Trans. A 9A, 671–679 (1978)CrossRef
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Davies, R.G.: The deformation behavior of a vanadium-strengthened dual phase steel. Metall. Trans. A 9A, 41–52 (1978)CrossRef
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Fillafer, A., Krempaszky, C., Werner, E.: On strain partitioning and micro-damage behavior of dual-phase steels. Mater. Sci. Eng. A 614, 180–192 (2014)CrossRef
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Fillafer, A.: Fließ- und Mikroschädigungsverhalten ferritisch martensitischer Dualphasenstähle, Ph.D thesis, Technische Universität München (2015)
8.
Erdogan, M., Priestner, R.: Effect of epitaxial ferrite on yielding and plastic flow in dual phase steel in tension and compression. Mater. Sci. Technol. 15, 1273–1284 (1999)
9.
Liedl, U.: Anfangsverformung- und Alterungsverhalten von Dual-Phasen Stahl, Ph.D thesis, Technische Universität München (2003)
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Abaqus. Manuals, Version 6.10EF. Dassault Systèmes Simulia Corp. (2010)
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Liedl, U., Traint, S., Werner, E.A.: An unexpected feature of the stress-strain diagram of dual-phase steel. Comput. Mater. Sci. 25, 122–128 (2002)CrossRef
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Kim, N.J., Thomas, G.: Effects of morphology on the mechanical behavior of a dual phase fe/2si/0.1c steel. Metall. Trans. A 12A, 483–489 (1981)CrossRef
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Daxner, T.: Finite element modelling of cellular materials. In: Altenbach, H., Öchsner, A. (eds.) Cellular and Porous Materials in Structures and Processes, pp. 47–106. Springer, Wien (2010)
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Metadata
Title
On Phase Transformation Induced Effects Controlling the Flow Behavior of Ferritic-Martensitic Dual-Phase Steels
Authors
A. Fillafer
E. Werner
C. Krempaszky
Copyright Year
2018
Book
Advances in Mechanics of Materials and Structural Analysis

Print ISBN: 978-3-319-70562-0

Electronic ISBN: 978-3-319-70563-7

Copyright Year: 2018

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

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