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Features of the phase composition of nickel alloys with high tungsten and molybdenum contents

  • Heat-Resistant Steels and Alloys
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Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    In the high-temperature hardened condition with a total tungsten and molybdenum content in the alloys of not more than 8 at. % α2, σ, and μ type excess phases are not formed and only complex carbides are present. In the alloys without molybdenum but containing 6.5 at. % W hardening α2-phase is precipitated.

  2. 2.

    The high-temperature strength of alloys containing ≥6.5 at. % W is higher than of alloys containing about 8 at. % W+Mo, which is related not only to hardening by these elements of the γ-solid solution but also to formation of excess α2-phase.

  3. 3.

    In the alloys containing more than 5–6% each of W and Mo (or ΣW+Mo≥5 at. %) type M6C binary chromium carbide is present, while with ΣW+Mo≤5 at. % type M23C6 cubic carbide is precipitated, which has a positive influence on the high-temperature strength of the investigated alloys.

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Literature cited

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Authors
  1. O. V. Novichkova
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  2. I. I. Kaputkin
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  3. E. A. Ul'yanin
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Additional information

I. P. Bardin Central Scientific-Research Institute for Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 31–34, December, 1989.

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Novichkova, O.V., Kaputkin, I.I. & Ul'yanin, E.A. Features of the phase composition of nickel alloys with high tungsten and molybdenum contents. Met Sci Heat Treat 31, 895–899 (1989). https://doi.org/10.1007/BF00798233

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  • DOI: https://doi.org/10.1007/BF00798233

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