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Phases present in the wrought superalloy Udimet 700

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Summary

Normal phases found in fully heat treated wrought Udimet 700 are MC, M23C6, M3B2, gamma prime, and gamma matrix.

During prolonged heating at temperatures below 1850°F, MC carbide decomposes, and increased quantities of M23C6 form.

If Udimet 700 is heated above its incipient melting point, the normal high parameter molybdenumrich M3B2 boride transforms to a low parameter chromium-rich M3B2 boride. Subsequent heating at 2150°F causes the boride to revert to the molybdenum rich high parameter boride.

Gamma prime exists both as normally square and very fine particles in the as-heat-treated condition but agglomerates during prolonged high temperature service to form elongated particles.

If the average electron vacancy concentration is greater than Nv = 2.38, Udimet 700 is sigma prone.

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References

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Authors and Affiliations

  1. Special Metals Corp., New Hartford, N.Y., USA

    W. J. Boesch (Senior Research Metallurgist) & H. B. Canada (Senior Research Chemist)

Authors
  1. W. J. Boesch
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  2. H. B. Canada
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Boesch, W.J., Canada, H.B. Phases present in the wrought superalloy Udimet 700. JOM 20, 46–50 (1968). https://doi.org/10.1007/BF03378694

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  • DOI: https://doi.org/10.1007/BF03378694

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