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Influence of DIT Parameters on the Cementite Spheroidization in a Low-Alloy Medium Carbon Steel

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Abstract

The influence of strain, strain rate, and temperature on deformation-induced transformation (DIT) in a low-alloy medium carbon steel is studied. The strain promotes the nucleation of ferrite (deformation-induced ferrite) and also pearlite (deformation-induced pearlite), this last being characterized by a fine interlamellar spacing and morphological instability. At strains ε > 0.5, intragranular nucleation activates and further ferrite nucleation over the newly created α/γ interface takes place, which gives rise to the precipitation of cementite (deformation-induced cementite) at the ferrite boundaries. Soft annealing treatments have been performed on the microstructures obtained by DIT, and the degree of spheroidization has been quantified by image analysis techniques. In comparison to non-deformed conditions, the application of DIT results in a higher degree of spheroidization after soft annealing. Moreover, the EBSD analysis denotes that ferrite grain size refinement is achieved with respect to non-deformed conditions. The degree of spheroidization is highly influenced by the applied strain level and subsequent holding temperature.

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Acknowledgment

Partial financial support of this work by the Spanish Science and Innovation Department (CICYT MAT2010-17672 Project) is acknowledged.

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Authors and Affiliations

  1. CEIT and Tecnun, University of Navarra, Pº de Manuel Lardizabal 15, 20018, San Sebastián, Basque Country, Spain

    Jon Arruabarrena (Researcher), Beatriz López (Professor) & Jose M. Rodriguez-Ibabe (Professor)

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  1. Jon Arruabarrena
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  2. Beatriz López
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  3. Jose M. Rodriguez-Ibabe
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Corresponding author

Correspondence to Jose M. Rodriguez-Ibabe.

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Manuscript submitted April 30, 2015.

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Arruabarrena, J., López, B. & Rodriguez-Ibabe, J.M. Influence of DIT Parameters on the Cementite Spheroidization in a Low-Alloy Medium Carbon Steel. Metall Mater Trans A 47, 412–423 (2016). https://doi.org/10.1007/s11661-015-3207-7

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