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Intercrystalline corrosion in alloys of the N70M28 type

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Conclusions

  1. 1.

    A continuous network of carbides in the grain boundaries is the basic reason for the susceptibility of alloy N70M28 to ICC after heating at high temperatures.

  2. 2.

    The susceptibility to ICC in the high-temperature range is eliminated by the addition of 3.5–5.3% W, while the addition of 1.1–2.6% Ti and 0.012–0.12% Zr increase the susceptibility to ICC at these temperatures.

  3. 3.

    The susceptibility of alloy N70M28 to ICC in the low-temperature range is due to the formation of the intermetallic phase Ni4Mo and the accompanying stresses. Strong carbide-forming elements (tungsten, titanium, and zirconium) have no effect on the susceptibility to ICC in the low-temperature range.

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Literature cited

  1. 1.

    S. S. Pavlov and T. V. Svistunova, Metal. i Term. Obrabotka Metal., No. 11 (1968).

  2. 2.

    D. Harker, jtJ. of Chemical Physics,12, No. 7 (1944).

  3. 3.

    E. N. Vlasova, Fiz. Metal. Metalloved.,23, No. 5 (1967).

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Additional information

Moscow Institute of Chemical Machine Construction; Central Scientific-Research Institute of Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 10, pp. 20–22, October, 1970.

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Pavlov, S.S., Svistunova, T.V. Intercrystalline corrosion in alloys of the N70M28 type. Met Sci Heat Treat 12, 830–832 (1970). https://doi.org/10.1007/BF00654467

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Keywords

  • Titanium
  • Zirconium
  • Carbide
  • Tungsten
  • Intermetallic Phase