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Nodule Evolution of Ductile Cast Iron During Solidification

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Abstract

Ductile cast irons are ferrous alloys in which precipitation of graphite in the form of spherical nodules is embedded in a metal matrix to obtain ductility on the material. Despite the importance of the shape of the nodules, the models proposed to predict the solidification of ductile irons assume a perfect spherical shape during the growing process up to the final solidification of the material, which is proved not to be the case in all castings depending on the processing conditions. The influence of the process parameters on the geometry of the nodules in ductile irons was experimentally evaluated and a model to predict the evolution of nodules during solidification was proposed. The proposed model for growth predicts changes in the nodule count as well as in the nodularity based on different laws for carbon diffusion according to the solid fraction, helping to understand the trends found experimentally.

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Acknowledgments

The authors would like to express their gratitude to the foundry Furima S.A.S, Medellín, Colombia, for providing the materials used in this study. It is also important to acknowledge the economic support for this study provided by the Administrative Department of Science, Technology and Innovation, Colciencias (Colombia), Contract No. 525-09. Finally, the authors gratefully acknowledge the financial support provided by FONDECYT (Project No. 1130404).

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Authors and Affiliations

  1. Engineering Materials Research Group, School of Engineering, Eafit University, Cra 49 No. 7 Sur 50, Medellín, Colombia

    S. C. Murcia (M.Sc. Student, Ph.D. Student) & E. A. Ossa (Professor)

  2. University of Maryland Baltimore, Baltimore, MD, USA

    S. C. Murcia (M.Sc. Student, Ph.D. Student)

  3. Mechanical and Metallurgical Engineering Department, Pontificia Universidad Católica de Chile, Vicuña Mackenna # 4860, Macul, Santiago, Chile

    D. J. Celentano (Associate Professor)

Authors
  1. S. C. Murcia
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  2. E. A. Ossa
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  3. D. J. Celentano
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Corresponding author

Correspondence to E. A. Ossa.

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Manuscript submitted June 18, 2013.

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Murcia, S.C., Ossa, E.A. & Celentano, D.J. Nodule Evolution of Ductile Cast Iron During Solidification. Metall Mater Trans B 45, 707–718 (2014). https://doi.org/10.1007/s11663-013-9979-5

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  • DOI: https://doi.org/10.1007/s11663-013-9979-5

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