Metal Science and Heat Treatment

, Volume 21, Issue 2, pp 109–114 | Cite as

Change in the structure of hot-worked austenite in nickel steels during post-deformation holding

  • M. L. Bernshtein
  • L. M. Kaputkina
  • N. A. Nikishov
Theory
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Conclusions

  1. 1.

    Hot deformation and brief (<2 sec) holding at high (900\dg) temperatures is accompanied by softening processes in nickel steels 60N20 and 80N18 \3- polygonization and recrystallization of austenite \3- which leads to irregularities in the substructure through the volume.

     

With increasing deformation, and with the same deformation but increasing carbon concentrations, the volume recrystallized and the volume of polygonized substructure in the deformed matrix increase.

  1. 2.

    With post-deformation isothermal holding the polygonized substructure is rebuilt, static polygonization occurs, and also static recrystallization. The rate of these softening processes increases with increasing deformation, decreasing size of the original austenite grains, and increasing carbon concentrations.

     
  2. 3.

    Under the deformation conditions selected the final structure of the steels investigated depends on the development of recrystallization. Up until completion of primary recrystallization the size of the recrystallized grains remains \s<10 μ and the dislocation density remains high.

     

Keywords

Nickel Austenite Recrystallization Final Structure Dislocation Density 

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Literature cited

  1. 1.
    M. L. Bernshtein, Strength of Steel [in Russian], Advances in Modern Metallurgy Series, Metallurgiya, Moscow (1974).Google Scholar
  2. 2.
    M. L. Bernshtein et al., "Structure of hot worked austenite and changes during holding after deformation," Fiz. Met. Metalloved.,42, No. 4, 804 (1976).Google Scholar
  3. 3.
    M. A. Shtremel' and B. G. Belyakov, "The possibility of electron microscopic measurements of dislocation density," Fiz. Met. Metalloved.25, No. 1, 140 (1968).Google Scholar
  4. 4.
    M. L. Bernshtein, L. M. Kaputkina, and N. A. Nikishov, "Structural changes in austenite during hot deformation," in: Materials of the Seminar-Conference on Use of Transmission and Scanning Microscopy in Metal Science [in Russian], MDNTP, Moscow (1976), p. 36.Google Scholar
  5. 5.
    A. G. Kozlova and L. M. Utevskii, "Stress relaxation and formation of dislocation arrays in hot worked austenite during thermomechanical treatment" in: Problem of Metal Science and Physics of Metals [in Russian], No. 1 (1972), p. 161.Google Scholar
  6. 6.
    L. M. Utevskii and F. R. Khashimov, "Dislocation arrays in deformed austenite and their ‘inheritance’ by martensite," Metalloved. Term. Obrab. Met., No. 4, 5 (1966).Google Scholar
  7. 7.
    L. M. Clarebrough, M. E. Hargreaves, and M. N. Loretto, "Changes in internal energy during recovery and recrystallization," in: Recovery and Recrystallization of Metals [Russian translation], Metallurgiya, Moscow (1966), p. 69.Google Scholar
  8. 8.
    S. S. Gorelik, "Recovery (rest, polygonization) and recrystallization," in: Metal Science and Heat Treatment [in Russian], Vol. 6, VINITI, Moscow (1972), p. 5.Google Scholar

Copyright information

© Plenum Publishing Corporation 1979

Authors and Affiliations

  • M. L. Bernshtein
  • L. M. Kaputkina
  • N. A. Nikishov

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