Metal Science and Heat Treatment

, Volume 20, Issue 5, pp 353–356 | Cite as

Impact-fatigue strength of medium-carbon high-nickel steel

  • Yu. B. L'vov
  • M. D. Perkas
  • A. Ya. Maloletnev
  • R. D. Zaitseva
Structural Steels

Conclusions

  1. 1.

    Medium-carbon nickel steels with σb = 180–190 kgf/mm2 have high impact-fatigue strength and can be recommended as structural materials for machine parts subject to cyclic impact loads.

     
  2. 2.

    Raising the nickel content of medium-carbon steel (0.4%) from 10 to 14% permits a substantial increase of the impact-fatigue strength.

     
  3. 3.

    The γ→α transformation occurs in medium-carbon nickel steels with cyclic impact loading. This substantially increases the number of cycles to failure of steel 40N14 at cyclic stresses σmax ≤ 240 kgf/mm2.

     
  4. 4.

    With σmax> 240 kgf/mm2 the presence of a large quantity of retained austenite in steel 40N14 leads to a reduction of resistance to repeated impact, since relaxation processes occur to a lesser extent in newly formed crystals of martensite with high rates of crack propagation.

     

Keywords

Nickel Austenite Martensite Structural Material Relaxation Process 

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Literature cited

  1. 1.
    R. D. Zaitseva and M. D. Perkas, “High-strength nickel steels”, Metalloved. Term. Obrab. Met., No. 10, 53 (1969).Google Scholar
  2. 2.
    A. Ya. Maloletnev et al., “Resistance of maraging steel N18K9M5T to cyclic impact loads”, Metalloved. Term. Obrab. Met., No. 7, 37 (1975).Google Scholar
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    E. Steigerwald and G. Hanna, ASTM,62, 885 (1962).Google Scholar
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    A. P. Gulyaev, Clean Steel [in Russian], Metallurgiya, Moscow (1975), p. 7.Google Scholar
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    M. M. Shteinberg et al. “Effect of alloying elements on the martensitic transformation in Fe-Ni alloys”, Fiz. Met. Metalloved.,26, No. 2, 331 (1968).Google Scholar
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    M. D. Perkas, Structure and Properties of High-Strength Maraging Steels [in Russian], Mashinostroenie Moscow (1974).Google Scholar
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    L. M. Shkol'nik, Crack Growth Rate and Time to Failure of Metals [in Russian], Metallurgiya, Moscow (1973), p. 106.Google Scholar

Copyright information

© Plenum Publishing Corporation 1978

Authors and Affiliations

  • Yu. B. L'vov
  • M. D. Perkas
  • A. Ya. Maloletnev
  • R. D. Zaitseva

There are no affiliations available

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