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Decomposition of δ-ferrite during tempering of steels 08Kh19N9F2S2 and 0Kh20N11M3BT (ÉP89)

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Conclusions

  1. 1.

    It was established that the basic scheme of the decomposition of δ-ferrite during tempering of austenitic-ferritic steels is δ→M23C6+δ; δ→γ′+δ; δ→σ+γ″. Depending on the composition of the steel and the heat treatment, any of the three phases may be formed first — M23C6, γ′, or σ.

  2. 2.

    Because of the high rate of embrittlement of steel 0Kh20N11M3BT (particularly cold-worked), slow heating and cooling in the temperature range where σ-phase is formed must be avoided during heat treatment.

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Literature cited

  1. 1.

    I. Ya. Sokol, Byulleten' TsIINChM, No. 24 (1964).

  2. 2.

    É. Houdremont, Special Steels, Vol. 1 [Russian translation], Metallurgizdat (1959).

  3. 3.

    O. A. Bannykh, Metal. i Term. Obrabotka Metal., No. 4 (1964).

  4. 4.

    A. P. Gulyaev and T. A. Zhadan, in: Collection of Reports of the Central Scientific Research Institute of Ferrous Metallurgy, Special Steels and Alloys, No. 46 [in Russian], Metallurgiya (1966).

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    H. Schuman, Neue Hütte, No. 12 (1959).

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    H. T. Schirley, J. Iron Steel Inst. (London),174 (1953).

  7. 7.

    M. I. Zakharova, in: Metal Science and Heat Treatment, No. 2 [in Russian], Mashgiz (1960).

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Additional information

Serp i Molot Moscow Metallurgical Plant. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 30–34, May. 1968.

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Sokol, I.Y., Frid, Y.L. Decomposition of δ-ferrite during tempering of steels 08Kh19N9F2S2 and 0Kh20N11M3BT (ÉP89). Met Sci Heat Treat 10, 361–364 (1968). https://doi.org/10.1007/BF00650624

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Keywords

  • Heat Treatment
  • Basic Scheme
  • Slow Heating