Metal Science and Heat Treatment

, Volume 19, Issue 2, pp 105–108 | Cite as

Structural inheritance during heat treatment of forgings of steel 35KhN1M2F

  • I. Ya. Chernikhova
  • N. N. Aleksandrova
  • P. V. Sklyuev
  • V. N. Trubin
Heat Treatment Technology
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Conclusions

  1. 1.

    Heat treatment of steel 35KhN1M2F with a crystallographically ordered (martensitic or bainitic) structure after preliminary heating at 1100–1300° reestablishes the original grains size. If the structure is pearlitic after preliminary high-temperature heating then grain refining results from subsequent recrystallization.

     
  2. 2.

    With an original crystallographically ordered structure the original grain size is reestablished with repeated austenitizing at temperatures up to 900°. Recrystallization begins at 950°. The recrystallized grains are 1–2 grades smaller than the original grains.

     
  3. 3.

    Slow cooling in the austenitic range after heating at high temperature, prolonged high-temperature tempering before repeated heat treatment, and additional heat treatment with phase recrystallization weaken the structural inheritance, and promite grain refining.

     
  4. 4.

    To ensure a fine-grained structure in forgings of steel 35KhN1M2F after final heat treatment it is necessary to obtain a pearlitic structure in the process of cooling after forging.

     

If the bainitic transformation is suppressed in the process of cooling after forging and a pearlitic structure is obtained (with forging of rolled products, e. g.), then the grains can be refined by additional quenching or normalization at a higher temperature (950–1000°), ensuring recrystallization of the reestablished coarsegrained structure.

Keywords

Heat Treatment Recrystallization Slow Cool Additional Heat Rolled Product 

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Literature cited

  1. 1.
    V. D. Sadovskii, Structural Inheritance in Steel [in Russian], Metallurgiya, Moscow (1973).Google Scholar

Copyright information

© Plenum Publishing Corporation 1977

Authors and Affiliations

  • I. Ya. Chernikhova
  • N. N. Aleksandrova
  • P. V. Sklyuev
  • V. N. Trubin

There are no affiliations available

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