Advertisement

Strength of Materials

, Volume 17, Issue 3, pp 417–422 | Cite as

Deformation and elastic properties of WC-Co system sintered carbides in micro- and macroindentation

  • V. I. Tumanov
  • L. A. Konyukhova
  • N. N. Gerasechko
  • I. P. Ragozin
  • V. F. Ochkasov
Scientific-Technical Section
  • 30 Downloads

Conclusions

  1. 1.

    The work of deformation of WC-Co system alloys in micro- and macroindentation was determined and the character of its change in relation to the binder phase content was shown. The work of deformation with a constant depth of indentation of the indentor is a more sensitive characteristic relative to the structure of tungsten sintered carbides than with a constant load.

     
  2. 2.

    The share of elastic deformation and of the work of elastic deformation of tungsten carbide is very significant in relatively brittle alloys with a low cobalt content while, on the other hand, in high-cobalt alloys the total work of deformation in indentation of the indentor is basically determined by the work of plastic deformation of the binder phase.

     
  3. 3.

    Determination of the modulus of elasticity of WC-Co system alloys from the unloading branch of the indentor indentation curves showed the possibility of establishment of this characteristic by that method. The divergence from the values obtained by the ultrasonic method is related to relaxation processes at comparatively low loading rates.

     
  4. 4.

    The deviation of the change in the work of elastic deformation in indentation of the indentor and of the modulus of elasticity of the alloys from linearity is related to features of their structure and primarily to the high degree of proximity of the carbide phase in the low-cobalt sintered carbides.

     
  5. 5.

    The increase in hardness with low loads for tungsten carbide and the relatively brittle low-cobalt sintered carbides in relation to the force in indentation of the indentor is the same as for many brittle refractory compounds.

     

Keywords

Carbide Brittle Elastic Deformation Tungsten Carbide Carbide Phase 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Literature Cited

  1. 1.
    E. S. Berkovich and L. B. Kraposhina, “The new IMASh instrument, an interface depth gauge, for microhardness tests based on the depth of the impression: examples of its use,” in: New in the Area of Microhardness Tests [in Russian], Nauka, Moscow (1974), pp. 93–100.Google Scholar
  2. 2.
    V. P. Alekhin, G. S. Berlin, G. N. Kalei, et al., “The UPM-1 instrument for measurement of microhardness based on the depth of the impression with automatic recording of the load and the depth of indentation,” ibid., pp. 100–107.Google Scholar
  3. 3.
    M. P. Markovets, Determination of the Mechanical Properties of Metals from Hardness [in Russian], Mashinostroenie, Moscow (1979).Google Scholar
  4. 4.
    S. I. Bulychev, V. P. Alekhin, and A. P. Ternovskii, “Determination of the physicochemical properties of materials by the method of continuous indentation of an indentor,” Fiz.-Khim. Obrab. Mater., No. 2, 58–63 (1976).Google Scholar
  5. 5.
    S. I. Bulychev, V. P. Alekhin, M. Kh. Shorshorov, and A. P. Ternovskii, “An investigation of the mechanical properties of materials with the use of a kinetic load-impression depth curve in microindentation,” Probl. Prochn., No. 9, 79–83 (1976).Google Scholar
  6. 6.
    B. V. Mott and E. S. Berkovich (eds.), Hardness Tests by Microindentation [Russian translation], Metallurgizdat, Moscow (1960).Google Scholar
  7. 7.
    O. N. Girgor'ev, Yu. V. Mil'man, V. N. Skvortsov, et al., “The resistance of covalent crystals to microindentation,” Poroshk. Metall., No. 8, 72–80 (1977).Google Scholar

Copyright information

© Plenum Publishing Corporation 1985

Authors and Affiliations

  • V. I. Tumanov
  • L. A. Konyukhova
  • N. N. Gerasechko
  • I. P. Ragozin
  • V. F. Ochkasov

There are no affiliations available

Personalised recommendations