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Heat treatment of cast tungsten alloys

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Conclusions

  1. 1.

    We examined the characteristic effects of heat treatment (heating temperature) on the structure of tungsten alloys of three groups — solid solutions based on tungsten, alloys containing secondary carbides (W2C or MC) along with the solid solution, and alloys containing eutectics.

  2. 2.

    The optimal structure (finely-dispersed and evenly-distributed carbide precipitates of the MC type) of cast alloys based on tungsten containing carbide phase can be obtained by alloying such that the composition in a given temperature range corresponds to regions W+MC or W+W2C+MC on ternary or more complex phase diagrams. It is preferable if the alloying elements permit slag remelting with subsequent rapid cooling. For cast VAR and EBR alloys with large grains and large carbide particles we recommend high-temperature heat treatment (above 2500°C), followed by deformation at lower temperatures.

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Literature cited

  1. 1.

    E. M. Savitskii et al.. "The tungsten corners of the W−C−M (Nb, Ta, Re) system", in: General Rules in Constructing Phase Diagrams of Metallic Systems [in Russian], Nauka (1973), pp. 139–142.

  2. 2.

    V. A. Vedernikova et al., "Tungsten corner of W−Zr−C system at 1700 and 2000°C", in: Structure of Phases, Phase Transformations, and Phase Diagrams of Metallic Systems [in Russian], Nauka, Moscow (1973), p. 115.

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    E. From and U. Roy, Phys. Stat. Sol.,9, No. 2, 83 (1965).

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    E. M. Savitskii, K. B. Povarova, and I. G. Kondakhchan, "Phase diagram of the W−Os−C system in the tungsten-rich region", in: Structure of Phases, Phase Transformations, and Phase Diagrams of Metallic Systems [in Russian], Nauka, Moscow (1973), p. 120.

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    E. M. Savitskii, M. A. Tylkina, and K. B. Povarova, "Effect of heat treatment of structure and properties of alloy MR-47VP", in: Rhenium in New Technology [in Russian], Nauka, Moscow (1970), p. 81.

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    E. M. Savitskii, K. B. Povarova, and M. V. Makarov, "Structure and properties of some tungsten alloys with niobium, tantalum, and rhenium", in: Alloys of Rare Metals with Special Physical Properties [in Russian], Nauka, Moscow (1974), p. 174.

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    E. M. Savitskii, K. B. Povarova, and P. V. Makarov, "Phase analysis of W−Nb−C system", in: Structure of Phases, Phase Transformations, and Phase Diagrams of Metallic Systems [in Russian], Nauka, Moscow (1974), p. 120.

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    E. M. Savitskii et al., "Metallography of cast tungsten", Izv. Akad. Nauk SSSR, Metally, No. 6, 177–185 (1972).

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    A. I. Nakonechnikov, L. V. Pavlinov, and V. N. Bykov, "Diffusion in metals with bcc lattice", Fiz. Met. i Metal.,22, No. 2, 234–238 (1966).

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Additional information

Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 4, pp. 17–20, April, 1975.

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Savitskii, E.M., Povarova, K.B., Shegai, A.A. et al. Heat treatment of cast tungsten alloys. Met Sci Heat Treat 17, 291–294 (1975). https://doi.org/10.1007/BF00663386

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Keywords

  • Carbide
  • Heat Treatment
  • Solid Solution
  • Tungsten
  • Heating Temperature