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Effect of retained austenite on the contact fatigue strength of carburized steel

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Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    The amount of retained austenite in steel 18KhGNMFL affects the contact fatigue strength of the carburized case after quenching from temperatures in the intercritical range and from temperatures above the upper critical point. In the first instance the amount of martensite also increases with the amount of retained austenite and the contact fatigue strength increases. In the second instance the larger quantity of retained austenite leads to a reduction of the percentage of martensite in the structure, lowering the contact fatigue strength.

  2. 2.

    The optima properties of the core are ensured by quenching steel 18KhGNMFL from 790°. Since the carbon content of the carburized case exceeds 0.8% at a depth of 0.3 mm, the case is quenched from the intercritical range, i. e., an increase in the amount of retained austenite in the surface layer after complete CTT does not lower the contact fatigue strength.

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Literature cited

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Authors
  1. B. B. Vinokur
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  2. S. E. Kondratyuk
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  3. L. I. Markovskaya
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  4. R. A. Khrunik
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  5. A. A. Gurmaza
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  6. V. B. Vainerman
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Additional information

Institute of Casting Problems, Academy of Sciences of the Ukrainian SSR. Physicomechanical Institute, Academy of Sciences of the Ukrainian SSR. Ukrainian Agricultural Academy. Dzerzhinskii Machine Construction Factory, Sarapul. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 11, pp. 47–49, November, 1978.

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Vinokur, B.B., Kondratyuk, S.E., Markovskaya, L.I. et al. Effect of retained austenite on the contact fatigue strength of carburized steel. Met Sci Heat Treat 20, 927–930 (1978). https://doi.org/10.1007/BF00713758

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  • DOI: https://doi.org/10.1007/BF00713758

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