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Influence of elastic and plastic anisotropy on the flow behavior in a duplex stainless steel

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Abstract

The load partitioning between two phases in a cold-rolled duplex stainless steel has been experimentally studied in situ by X-ray diffraction, for different loading directions. It was found that the load partitioning between the two phases is dependent on the loading direction. For loading in the rolling direction, both phases deform plastically to the same degree, while more plastic deformation occurs in the austenitic phase during loading in the transverse direction. For loading in the 45-deg direction, more plastic deformation occurs in the ferritic phase. The strong crystallographic texture in the ferritic phase makes the material anisotropic, with a higher stiffness and yield strength in the transverse direction compared to the rolling direction. The measured texture was used as input to theoretical predictions of both elastic and plastic anisotropy. The plastic anisotropy was predicted by assuming intragranular slip as the main deformation mechanism. The predicted anisotropic material properties were then used in finite-element simulations to study the flow behavior of the material in different directions. The predicted flow behavior was found to be in good agreement with the experimentally observed load partitioning between the phases for loading in the rolling and transverse directions. However, the yield strength of the ferritic phase during loading in the 45-deg direction was found to be lower than what was predicted. The reason for this is the difference in slip characteristics in different sample directions, because of the morphological texture.

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Author notes

  1. Johan J. Moverare Dr. (Graduate Student)

    Present address: the Division of Engineering Materials, Department of Mechanical Engineering, Linköping University, 581 83, Linköping, Sweden

Authors and Affiliations

  1. Alstom Power Swden AB, 612 82, Finspang, Sweden

    Johan J. Moverare Dr. (Graduate Student)

  2. the Division of Engineering Materials, Department of Mechanical Engineering, Linköping University, 581 83, Linköping, Sweden

    Magnus Odén (Professor)

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  1. Johan J. Moverare Dr.
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  2. Magnus Odén
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Moverare, J.J., Odén, M. Influence of elastic and plastic anisotropy on the flow behavior in a duplex stainless steel. Metall Mater Trans A 33, 57–71 (2002). https://doi.org/10.1007/s11661-002-0005-9

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  • DOI: https://doi.org/10.1007/s11661-002-0005-9

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