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Effect of different heat treatment regimes on the structure and properties of martensitic steel 90Kh18M

  • Corrosion-Resistant Steels
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Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    The hardness of steel 90Kh18M as a function of the hardening temperature in the interval from 900 to 1250°C has an extremum character. This is mainly due to strengthening processes in which there is an increase in the concentration of carbon in the martensite from 0.4 to 0.5% and a decrease in the hardness due to an increase in the amount of residual austenite from 1 to 93%.

  2. 2.

    In the high carbon martensitic steels (types 50Kh14MF and 90Kh18M) there is observed a temperature region below Ac1 in which there is precipitated an increased amount of austenite. This may be due to the presence of the reverse α to γ transformation.

  3. 3.

    The sharp decrease in the ductility of steel 90Kh18M observed at test temperatures of 1200°C and higher is due to fusion of the austenitic grain boundaries. This was evidenced by the presence of film-like carbides.

The following heat treatment regime is recommended for steel 90Kh18M: harden at 1050+ temper at 140°C (strengthening treatment); anneal at 750°C (softening treatment).

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Literature cited

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Authors
  1. S. D. Bogolyubskii
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  2. I. Yu. Konnova
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  3. N. M. Ostrikova
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  4. N. A. Pavlenko
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  5. I. I. Kaputkin
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Additional information

The I. P. Bardin Ferrous Metallurgy Scientific Research Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 1, pp. 28–30, January, 1991.

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Bogolyubskii, S.D., Konnova, I.Y., Ostrikova, N.M. et al. Effect of different heat treatment regimes on the structure and properties of martensitic steel 90Kh18M. Met Sci Heat Treat 33, 45–50 (1991). https://doi.org/10.1007/BF00775035

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  • DOI: https://doi.org/10.1007/BF00775035

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