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Microstructural and mechanical characterization of cobalt-based superalloys with the addition of boron and zirconium

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Abstract

In this study, the effects of small additions of boron and zirconium in the microstructure, mechanical properties, and porosity of cobalt-based superalloys fabricated under vacuum conditions, were investigated and compared to a cobalt-based superalloy with no additions. The characterization was performed in the as-cast and homogenized conditions. The microstructural characterization was conducted using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD). The experimental results indicate that the microstructure of the alloy is composed of a dendritic structure and the formation of MC and M23C6 carbides. Also, the porosity caused by micro-shrinkage during solidification was observed to be reduced by the B and Zr additions. Such a reduction was caused by the formation of zirconium carbides that produce an expansion in volume when they are formed at the end of the solidification process. After the homogenization heat treatment, the porosity level was observed to increase compared to that of the as-cast condition in both superalloys, this is due to the vacancy diffusion during the heat treatment.

Graphical abstract

SEM images of as-cast condition microstructure in as-polished samples, a alloy without B and Zr and b alloy with B and Zr

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Acknowledgments

This research was partially supported by CIC of the Universidad Michoacana de San Nicolas de Hidalgo. The authors wish to thank CONACYT-MEXICO for the scholarship provided to Martin R. Barajas-Alvarez during his doctoral studies.

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Authors and Affiliations

  1. Universidad Michoacana de San Nicolás de Hidalgo, Instituto de Investigación en Metalurgia y Materiales, Edificio U, Ciudad Universitaria, Morelia, Michoacán, Mexico

    Martín Ricardo Barajas-Álvarez, Arnoldo Bedolla-Jacuinde, Alberto Ruiz, Víctor H. López-Morelos & Francisco Vapeani Guerra-López

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  1. Martín Ricardo Barajas-Álvarez
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  2. Arnoldo Bedolla-Jacuinde
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  3. Alberto Ruiz
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  4. Víctor H. López-Morelos
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  5. Francisco Vapeani Guerra-López
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Correspondence to Martín Ricardo Barajas-Álvarez.

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Barajas-Álvarez, M.R., Bedolla-Jacuinde, A., Ruiz, A. et al. Microstructural and mechanical characterization of cobalt-based superalloys with the addition of boron and zirconium. MRS Advances 6, 923–927 (2021). https://doi.org/10.1557/s43580-021-00165-3

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  • DOI: https://doi.org/10.1557/s43580-021-00165-3

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