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Change of structure and properties of heterophase tungsten alloys in deformation

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  1. 1.

    In recrystallized carbide-strengthened vacuum arc melted tungsten alloy at about 1000°C there occur processes of strain aging, and this causes an abrupt increase of the Ludwik parameters A and n at the first stage of strain-hardening, and also a certain increase of σu.

  2. 2.

    At 1400°C or more the intense development of thermally activated processes of transverse slip and climbing motion of dislocations prevents the formation of a cellular structure, and this leads to an abrupt loss of strength of the alloy.

  3. 3.

    The optimal temperature range of deformation of low alloy carbide-strengthened tungsten alloys in the recrystallized state is 1400–1500°C. The strenght properties, and also the suitability of the material for strain-hardening at these temperatures are low while its ductility after deformation is high in consequence of the reduced effective grain size.

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Literature cited

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    E. M. Savitskii, K. B. Povarova, and P. V. Makarov, Metal Science of Tungsten [in Russian], Metallurgiya, Moscow (1978).

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    K. B. Povarova, "Principles of alloying heat-resistant tungsten alloys," Izv. Nauk SSSR, Met., No. 5, 145–153 (1982).

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    K. B. Povarova, L. S. Kosachev, G. A. Rymashevskii, et al., "Dispersion and solid-solution hardening of vacuum-remelted tungsten," Fiz. Khim. Obrab. Mater., No. 1, 123–128 (1983).

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    E. M. Savitskii, K. B. Povarova, P. V. Makarov, et al., "Mechanical properties of vacuum remelted and powder metallurgy tungsten in fine sections," Fiz. Khim. Obrab. Mater." No. 6, 91–95 (1983).

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    L. S. Kosachev and S. S. Semiletov, "Improving the ductility of heat-resistant tungsten alloys by heat treatment," in: Alloys of High Melting and Rare Metals for Operation at High Temperatures [in Russian], Nauka, Moscow (1984), pp. 71–81.

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    E. M. Savitskii, K. B. Povarova, Yu. O. Tolstobrov, et al., "Structure and properties of deformed alloys of the tungsten corner of the system W−Mo−Re−Hf−C," Izv. Akad. Nauk SSSR, Met., No. 2, 217–222 (1982).

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    Yu. O. Tolstobrov, M. N. Isaichev, and V. G. Lykov, "The effect of alloying and of heat treatment on the strain-hardening of tungsten alloys," in: Alloys of High Melting and Rare Metals for Operation at High Temperatures, [in Russian], Nauka, Moscow (1984), pp. 61–70.

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Additional information

A. A. Baikov Metallurgical Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 38–41, June, 1987.

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Povarova, K.B., Tolstobrov, Y.O. & Zavarzina, E.K. Change of structure and properties of heterophase tungsten alloys in deformation. Met Sci Heat Treat 29, 448–453 (1987). https://doi.org/10.1007/BF00715884

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  • Grain Size
  • Tungsten
  • Ductility
  • Cellular Structure
  • Abrupt Increase