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Study and Suppression of the Microstructural Anisotropy Generated During the Consolidation of a Carbonyl Iron Powder by Field-Assisted Hot Pressing

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Abstract

A spherical carbonyl iron powder was consolidated by the field-assisted hot pressing technique using graphite tools at two different temperatures, both above the austenitizing temperature. The microstructures obtained exhibited a compositional gradient in carbon along the consolidated material. Thus, the outer rim of the cylindrical samples was composed of cementite and pearlite that gradually turned to pearlite, leading to a fully ferritic microstructure at the core of the sample. The increase in the temperature has led to a higher introduction of carbon within the sample. The interposition of a thin tungsten foil between the graphite die/punches and the powders has significantly reduced the diffusion of the carbon through the iron matrix and has suppressed the microstructural anisotropy.

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Authors and Affiliations

  1. IMDEA Materials Institute, Calle Eric Kandel 2, 28906, Getafe, Madrid, Spain

    Andrea García-Junceda (Research Associate), Laura Acebo (Student) & José Manuel Torralba (Deputy Director)

  2. Universidad Carlos III Madrid, Av. Universidad 30, 28911, Leganés, Madrid, Spain

    José Manuel Torralba (Deputy Director)

Authors
  1. Andrea García-Junceda
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  2. Laura Acebo
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  3. José Manuel Torralba
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Corresponding author

Correspondence to Andrea García-Junceda.

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Manuscript submitted February 16, 2015.

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García-Junceda, A., Acebo, L. & Torralba, J.M. Study and Suppression of the Microstructural Anisotropy Generated During the Consolidation of a Carbonyl Iron Powder by Field-Assisted Hot Pressing. Metall Mater Trans A 46, 3192–3198 (2015). https://doi.org/10.1007/s11661-015-2919-z

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