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High-strain-rate behavior of low-alloy multiphase aluminum- and silicon-based transformation-induced plasticity steels

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Abstract

High-strength, low-alloy transformation-induced plasticity (TRIP) steels are advanced multiphase steel grades that combine high-strength levels with an excellent ductility, making them ideally suited for application in crash-relevant parts of automotive car bodies. The enhanced plastic hardening and deformability are due to a complex interaction between the microstructural phases and to the transformation of metastable austenite to martensite during plastic deformation. During high-strain-rate loading, not only the material but also the transformation will be influenced by adiabatic heating. The impact-dynamic properties of CMnAl- and CMnSi-TRIP steels were determined in the range of 500 to 2000 s−1 using a split Hopkinson tensile bar (SHTB) setup. Bake-hardening treatments were applied to study the effect of strain aging. The experiments show that strain-rate hardening is superior to thermal softening: yield stresses, deformation, and energy dissipation increase with the strain rate. Phenomenological material models were investigated to describe the strain-rate and temperature-dependent behavior of TRIP steels. Both the Johnson-Cook model and an extended version of the Ludwig model were found to give good agreement with the experimental data.

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Authors and Affiliations

  1. Department of Mechanical Construction and Production, Ghent University, B-9000, Ghent, Belgium

    J. Van Slycken (Research Assistant), P. Verleysen (Full Professor, Mechanic of Material and Structure) & J. Degrieck (Full Professor, Mechanic of Material and Structure)

  2. Laboratory of Iron and Steelmaking, Ghent University, B-9000, Ghent, Belgium

    L. Samek (Research Assistant) & B. C. de Cooman (Full Professor)

  3. Department of Metallurgy and Materials Science, Ghent University, B-9000, Ghent, Belgium

    L. Samek (Research Assistant) & B. C. de Cooman (Full Professor)

Authors
  1. J. Van Slycken
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  2. P. Verleysen
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  3. J. Degrieck
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  4. L. Samek
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  5. B. C. de Cooman
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Van Slycken, J., Verleysen, P., Degrieck, J. et al. High-strain-rate behavior of low-alloy multiphase aluminum- and silicon-based transformation-induced plasticity steels. Metall Mater Trans A 37, 1527–1539 (2006). https://doi.org/10.1007/s11661-006-0097-8

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  • DOI: https://doi.org/10.1007/s11661-006-0097-8

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