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Atom Probe Tomography Analysis of Precipitation during Tempering of a Nanostructured Bainitic Steel

  • Symposium: Austenite Formation and Decomposition IV
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Abstract

Carbon distribution during tempering of a nanostructured bainitic steel was analyzed by atom probe tomography (APT). Three different types of particles are detected on samples tempered at 673 K (400 °C) for 30 minutes: lower bainite cementite with a carbon content of ~25 at. pct, ε-carbides with a carbon content close to 30 at. pct, and carbon clusters, small features with a carbon content of ~14 at. pct indicative of a stage of tempering prior to precipitation of ε-carbide. After tempering at 773 K (500 °C) for 30 minutes, the ε-carbide-to-cementite transition was observed. Solute concentration profiles across carbide/ferrite interfaces showed the distribution of substitutional elements in ε-carbide and cementite for all the tempering conditions.

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Acknowledgments

The authors gratefully acknowledge the support of the Research Fund for Coal and Steel and the Spanish Ministry of Science and Innovation for funding this research under Contract Nos. RFSR-CT-2008-00022 and MAT2007-63873, respectively. The research was supported by ORNL’s Shared Research Equipment (SHaRE) User Facility, which is sponsored by the Office of Basic Energy Sciences, United States Department of Energy.

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Authors and Affiliations

  1. Centro Nacional de Investigaciones Metalúrgicas (CENIM-CSIC), Madrid, E-28040, Spain

    F. G. Caballero (Senior Scientist) & C. Garcia-Mateo (Tenure Scientist)

  2. Materials Science and Technology Division, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN, 37831-6136, USA

    M. K. Miller (Corporate Fellow)

Authors
  1. F. G. Caballero
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  2. M. K. Miller
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  3. C. Garcia-Mateo
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Correspondence to F. G. Caballero.

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Manuscript submitted November 18, 2010.

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Caballero, F.G., Miller, M.K. & Garcia-Mateo, C. Atom Probe Tomography Analysis of Precipitation during Tempering of a Nanostructured Bainitic Steel. Metall Mater Trans A 42, 3660–3668 (2011). https://doi.org/10.1007/s11661-011-0699-7

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  • DOI: https://doi.org/10.1007/s11661-011-0699-7

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