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Change of structure and properties of heterophase tungsten alloys in deformation

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Conclusions

  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).

  3. 3.

    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.

  6. 6.

    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.

  8. 8.

    P. Ludwik, Elements der technologischen Mechanik, Springer, Berlin (1909).

  9. 9.

    K. B. Povarova, L. S. Kosachev, V. A. Balashov et al., "Investigation of the effect of the phase composition, the deformation, and of the heat treatment on the cold shortness of tungsten and its alloys," Izv. Akad. Nauk SSSR, No. 5, 150–157 (1983).

  10. 10.

    J. R. Guimaraes, "On the analysing of stress-strain curves," Scr. Met.,8, 919–922 (1974).

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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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Keywords

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