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Some characteristics of the fracture of diphase steels during hot plastic deformation

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Conclusions

  1. 1.

    We found a boundary temperature above which and below which high-temperature plastic deformation of diphase 1Kh21N5T steel is characterized by different mechanisms. The boundary temperature is about 1200\dgC and matches the sharp change in the structure from approximately equal amounts of ferrite and austenite to a structure in which ferrite predominates.

    At temperatures below 1200°C cracks originate in austenite and develop in both phases.

    Above 1200°C cracks originate in ferrite grain boundaries. Simultaneously, at the edges of the crack the ferrite is saturated with nitrogen from the atmosphere and the δ→γ transformation occurs. The austenite formed in this case inhibits cracking at first and then leads to rapid development of the cracks.

  2. 2.

    The necessity of carefully removing surface defects from ingots and bars of 1Kh21N5T steel is well founded in view of their solution of atm ospheric nitrogen during deformation at 1200\2-1300\dgC, increasing the susceptibility of the steel to cracking as a consequence of the precipitation of austenite.

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Literature cited

  1. 1.

    P. O. Pashkov and V. A. Bratukhina, In: Metal Science [in Russian], Sudpromgiz (1957).

  2. 2.

    Yu. M. Chizhikov, Hardenability of Steels and Alloys [in Russian], Moscow, Metallurgizdat (1961).

  3. 3.

    A. A. Babakov, V. V. Levitin, M. I. Sinel'nikov, E. G. Fel'dgandler, et al., Chermetinformatsiya, Ser. 11, Bull. 4 (1965).

  4. 4.

    A. A. Babakov et al., In: Special Steels and Alloys, No. 66 [in Russian], Metallurgiya (1966).

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Additional information

UKRNIISpetsstal'; TsNIIChERMET. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 69–72, March, 1967.

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Sinel'nikov, M.I., Fel'dgandler, E.G. Some characteristics of the fracture of diphase steels during hot plastic deformation. Met Sci Heat Treat 9, 224–227 (1967). https://doi.org/10.1007/BF00653149

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Keywords

  • Nitrogen
  • Precipitation
  • Atmosphere
  • Ferrite
  • Austenite