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Strain aging of martensite and the fatigue strength of structural steel after surface strain hardening

  • Strength Characteristics
  • Published:
Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    Strain aging of martensite in steel 40KhNMA promotes a reduction of the residual compressive stresses resulting from strain hardening of the surface.

  2. 2.

    With strain aging of martensite in the quenched steel (quenching + SPD + tempering) the hardening of the surface layer reduces the decrease of the fatigue limit due to reduction of the residual stresses in the surface layer as the result of tempering. With strain aging of martensite in the tempered steel (quenching + tempering + SPD + aging) the relaxation of compressive stresses is smaller and hardening of the surface layer additionally increases the fatigue limit as compared with that resulting from strain hardening alone.

  3. 3.

    The increase in the fatiguestrength of steel 40KhNMA during strain aging of martensite in the surface layer depends also on the residual compressive stresses — the increase in the fatigue strength is higher for notched samples.

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Authors
  1. K. N. Martsenko
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  2. A. A. Astaf'ev
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  3. I. V. Kudryavtsev
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  4. L. N. Burmistrova
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  5. N. I. Burova
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Additional information

Central Scientific-Research Institute of Heavy Machine Construction. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 4, pp. 45–49, April, 1974.

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Martsenko, K.N., Astaf'ev, A.A., Kudryavtsev, I.V. et al. Strain aging of martensite and the fatigue strength of structural steel after surface strain hardening. Met Sci Heat Treat 16, 328–331 (1974). https://doi.org/10.1007/BF00679228

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  • DOI: https://doi.org/10.1007/BF00679228

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