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Discussion of “Investigation of Oxide Bifilms in Investment Cast Superalloy IN100 Parts I and II”*

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Abstract

Fuchs and Kaplan carried out experiments in an attempt to ascertain whether oxide bifilms were present in a vacuum-cast Ni-base superalloy but concluded negatively. Although this author challenged their interpretation of their findings, both parties had overlooked the presence in the alloy of boron which is now known to inhibit bifilm formation. However, even though boron can help significantly, improved filling system designs remain important if other damaging entrainment defects are to be avoided.

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References

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Authors and Affiliations

  1. Emeritus Professor of Casting Technology, Department of Metallurgy and Materials, University of Birmingham, Birmingham, UK

    John Campbell

Authors
  1. John Campbell
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Correspondence to John Campbell.

Additional information

*G.E. Fuchs and M.A. Kaplan: Metall. Mater. Trans. A, 2016, vol 47A, pp. 2346–75.

Manuscript submitted April 21, 2017.

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Campbell, J. Discussion of “Investigation of Oxide Bifilms in Investment Cast Superalloy IN100 Parts I and II”*. Metall Mater Trans A 48, 5151–5153 (2017). https://doi.org/10.1007/s11661-017-4223-6

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  • DOI: https://doi.org/10.1007/s11661-017-4223-6

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