Metal Science and Heat Treatment

, Volume 12, Issue 1, pp 16–18 | Cite as

Variation of the composition, structure, and hardness of cementite with quenching

  • A. A. Zhukov
  • V. A. Shalashov
  • V. K. Tomas
  • B. Ya Ul'yanova
Theory

Conclusions

  1. 1.

    With quenching of white synthetic cast irons (Fe−C and Fe−C−Cr) from temperatures up to 1000°C the cementite lattice is distorted, the volume of the unit cell decreases, the carbon content decreases, and the microhardness increases considerably. The phenomenon is reversible, and the observed effects of the hardening of cementite are removed by high-temperature tempering.

     
  2. 2.

    The fact that the results contradict earlier results can be explained by the completing processes — the effect of hardening of the carbide phase and the initial stages of graphitization occurring at high temperatures, particularly in commercial cast irons containing silicon.

     
  3. 3.

    The investigation confirmed Baikov's assumption that cementite is a phase of variable composition. With increasing temperatures cementite approaches austenite in its carbon concentration and the chains of octahedral cells of the iron sublattice.

     

Keywords

Iron Silicon Carbide Austenite Carbon Content 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Literature cited

  1. 1.
    A. A. Baikov, Zh. Russk. Metal. Obshch.,4, No. 1 (1910).Google Scholar
  2. 2.
    A. N. Rozanov, in: Metal Science and Contemporary Methods of Heat Treating Cast Iron [in Russian], Mashgiz, Moscow (1955).Google Scholar
  3. 3.
    I. I. Khoroshev, in Progressive Methods of Production in Machine Construction [in Russian], Mashgiz, Moscow (1957).Google Scholar
  4. 4.
    I. N. Bogachev and S. B. Rozhkova, Liteinoe Proizvodstov, No. 5 (1960).Google Scholar
  5. 5.
    M. Collins and D. Woodford, J. Iron Steel Inst.,203, No. 2 (1960).Google Scholar
  6. 6.
    V. A. Shalashov and A. A. Zhukov, Zh. Fiz. Khim., No. 3 (1969).Google Scholar
  7. 7.
    Yu. N. Taran and V. I. Novik, Liteinoe Proizvodstvo, No. 1 (1967).Google Scholar
  8. 8.
    N. Petch. J. Iron Steel Inst.,149, No. 1 (1944).Google Scholar
  9. 9.
    W. Stuckens and A. Michel, Bull. Soc. Chim. France, Nos. 8–9 (1962).Google Scholar
  10. 10.
    A. M. Belikov and A. A. Savinskaya, Fiz. Metal. i Metalloved.,14, No. 2 (1962).Google Scholar

Copyright information

© Consultants Bureau 1970

Authors and Affiliations

  • A. A. Zhukov
  • V. A. Shalashov
  • V. K. Tomas
  • B. Ya Ul'yanova

There are no affiliations available

Personalised recommendations