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On the Effect of Manganese on Grain Size Stability and Hardenability in Ultrafine-Grained Ferrite/Martensite Dual-Phase Steels

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Abstract

Two plain carbon steels with varying manganese content (0.87 wt pct and 1.63 wt pct) were refined to approximately 1 μm by large strain warm deformation and subsequently subjected to intercritical annealing to produce an ultrafine grained ferrite/martensite dual-phase steel. The influence of the Mn content on microstructure evolution is studied by scanning electron microscopy (SEM). The Mn distribution in ferrite and martensite is analyzed by high-resolution electron backscatter diffraction (EBSD) combined with energy dispersive X-ray spectroscopy (EDX). The experimental findings are supported by the calculated phase diagrams, equilibrium phase compositions, and the estimated diffusion distances using Thermo-Calc (Thermo-Calc Software, McMurray, PA) and Dictra (Thermo-Calc Software). Mn substantially enhances the grain size stability during intercritical annealing and the ability of austenite to undergo martensitic phase transformation. The first observation is explained in terms of the alteration of the phase transformation temperatures and the grain boundary mobility, while the second is a result of the Mn enrichment in cementite during large strain warm deformation, which is inherited by the newly formed austenite and increases its hardenability. The latter is the main reason why the ultrafine-grained material exhibits a hardenability that is comparable with the hardenability of the coarse-grained reference material.

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Author notes

  1. Marion Calcagnotto (Researcher)

    Present address: Salzgitter Mannesmann Forschung GmbH, 38239, Salzgitter, Germany

Authors and Affiliations

  1. Max-Planck-Institut für Eisenforschung GmbH, 40237, Düsseldorf, Germany

    Marion Calcagnotto (Researcher), Dirk Ponge (Group Leader) & Dierk Raabe (Director)

Authors
  1. Marion Calcagnotto
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  2. Dirk Ponge
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  3. Dierk Raabe
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Corresponding author

Correspondence to Dirk Ponge.

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Manuscript submitted September 27, 2010.

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Calcagnotto, M., Ponge, D. & Raabe, D. On the Effect of Manganese on Grain Size Stability and Hardenability in Ultrafine-Grained Ferrite/Martensite Dual-Phase Steels. Metall Mater Trans A 43, 37–46 (2012). https://doi.org/10.1007/s11661-011-0828-3

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