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Metal Science and Heat Treatment

, Volume 17, Issue 2, pp 125–128 | Cite as

Development of the hardness of the nitrided case

  • V. D. Yakhnina
  • V. V. Nikitin
Chemicothermal Treatment

Conclusions

  1. 1.

    Direct measurements of the hardness in the process of nitriding and during subsequent cooling showed that the hardness of the nitrided case develops primarily during cooling after completion of the nitriding process.

     
  2. 2.

    The high hardness of the nitrided case on steels alloyed with nitride-forming elements (Al, Mo) is the result of the overall hardening effect of: a) formation of nitrides of alloying elements in the process of nitriding (the hardening effect of these nitrides is negligible); b) precipitation and preprecipitation of dispersed nitrides of alloying elements in the process of the intermediate γ→α transformation; c) precipitation or preprecipitation of nitrides of alloying elements due to the lower solubility at decreasing temperatures.

     
  3. 3.

    The study of the development of the hardness of the nitrided case on alloys containing aluminum and molybdenum leads to the conclusion that the most effective mechanism of hardening is the precipitation or preprecipitation of dispersed nitrides of alloying elements in the process of the intermediate γ→α transformation.

     

Keywords

Precipitation Aluminum Molybdenum Nitrides Direct Measurement 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Literature cited

  1. 1.
    Yu. M. Lakhtin, Physical Basis of the Nitriding Process [in Russian], Mashgiz, Moscow (1948).Google Scholar
  2. 2.
    E. Houdremont, Special Steels [Russian translation], Vol. II, Metallurgiya, Moscow (1966), p. 1095.Google Scholar
  3. 3.
    F. Jones, J. Iron Steel Inst., 37 (1934).Google Scholar
  4. 4.
    V. D. Yakhnina and M. D. Dvortsin, “Effect of alloying elements on structure of the nitrided case on stainless steels and mechanism of its hardening,” Metal. i Term. Obrabotka Metal., 3, 17–23 (1967).Google Scholar
  5. 5.
    A. V. Belotskii, V. G. Permyakov, and I. Samsonyuk, “Nature of the hardness of nitrided steel,” Fiz. Metal. Metalloved.,26, 5, 942 (1968).Google Scholar

Copyright information

© Plenum Publishing Corporation 1975

Authors and Affiliations

  • V. D. Yakhnina
  • V. V. Nikitin

There are no affiliations available

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