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Metal Science and Heat Treatment

, Volume 31, Issue 9, pp 702–704 | Cite as

Influence of inoculation on the formation of secondary (polygonization) boundaries in cast iron

  • N. M. Sytnik
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Conclusions

  1. 1.

    High cooling rates cause the formation in uninoculated iron of zones heterogeneous in structure which in character of disposition resemble polygonized boundaries.

     
  2. 2.

    Inoculation of cast iron with small additions of elements (formation of compact forms of graphite together with lamellar) leads to formation of polygonized boundaries (coarse secondary grains) and under certain conditions (an increase in cooling rate) cracks are formed at these boundaries.

     
  3. 3.

    With an increase in graphite of the compact form in the structure of cast iron the size of the secondary grains in the iron decreases.

     
  4. 4.

    In the presence of spheroidal graphite in the structure of the iron the polygonization process is not observed.

     

Keywords

Iron Graphite Cool Rate Cast Iron Compact Form 
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.

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Literature cited

  1. 1.
    B. A. Movchan, Microscopic Inhomogeneity in Cast Alloys [in Russian], Gostekhizdat UkrSSR, Kiev (1962).Google Scholar
  2. 2.
    B. S. Bokshtein S. Z. Bokshtein, and A. A. Zhukovitskii, The Thermodynamics and Kinetics of Diffusion in Solids [in Russian], Metallurgiya, Moscow (1974).Google Scholar
  3. 3.
    N. I. Khvorinov, The Crystalliztion and Inhomogeneity of Steel [in Russian], Mashgiz, Moscow (1958).Google Scholar
  4. 4.
    B. A. Mochan and I. Ya. Dzykovich, "Possibilities of controlling the distribution of imperfections of the crystalline lattice in highly-alloyed cast alloys", in: Investigations of Heat-Resistant Alloys [in Russian], Vol. 9, Izd. Akad. Nauk SSSR, Moscow (1962), pp. 176–189.Google Scholar
  5. 5.
    B. C. Allen, D. Y. Maykuth, and R. Y. Joffe, "The recrystallization and ductile-brittle transition behavior of tungsten," J. Inst. Met., No. 4, 90 (1961).Google Scholar
  6. 6.
    R. L. Snezhnoi, "A theory of formation of spheroidal graphite", Lit. Proizv., No. 5, 3–5 (1980).Google Scholar
  7. 7.
    M. P. Shebatikov, "The role of inoculants in the process of formation of graphite inclusions of spheroidal form", Lit. Proizv., No. 1, 2–3 (1979).Google Scholar
  8. 8.
    B. Francis, "Heterogeneous nuclei and graphite chemistry in flake and nodular cast irons," Met. Trans., No. 1, 21–31 (1979).Google Scholar
  9. 9.
    L. Sofroni, J. Riposon, and J. China, Materials of the Iron Casting Process 2nd International Symposium, Geneva (1974).Google Scholar
  10. 10.
    B. A. Movchan, "Modern data on the boundaries of crystals in cast materials and alloys", in: New Problems of Welding Technology [in Russian], Tekhnika, Kiev (1964), pp. 288–300.Google Scholar
  11. 11.
    B. S. Mil'man, N. N. Aleksandrov, V. T. Solenkov, and L. V. Il'icheva, "Interphase tension and the form of graphite crystalizing in molten iron", Lit. Proizv., No. 5, 3–6 (1976).Google Scholar

Copyright information

© Plenum Publishing Corporation 1990

Authors and Affiliations

  • N. M. Sytnik

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