Advertisement

Metal Science and Heat Treatment

, Volume 29, Issue 5, pp 351–354 | Cite as

Effect of feeding method for industrial gases during high-temperature carbonitriding of articles

  • V. I. Shapochkin
  • A. V. Pozharskii
  • L. Ya. Kashcheev
Article
  • 17 Downloads

Conclusions

  1. 1.

    Impregnation of surface layers with nitrogen during high-temperature carbonitriding in an endothermic atmosphere depends on the input method and the rate of ammonia to the charge of articles being impregnated. The greatest content of residual ammonia, and consequently the content of nitrogen in the carbonitrided layer, is observed with input of ammonia through an injector and with an increase in the rate of its input to the surface of articles being impregnated from 180 to 250 m/sec.

     
  2. 2.

    The injector system developed for feeding industrial gases into the furnace space of a muffleless unit provides a reduction in scatter of layer thickness, content of carbon and nitrogen at the surface, and it makes it possible with an ammonia input of 10–12% of the gas carrier to obtain impregnation of surface layers with nitrogen to a depth of 0.05–0.6 mm up to 0.8–1.0 and to 0.3–0.5% respectively, and also to increase by 30–40% the rate of carbonitrided layer growth.

     

Keywords

Nitrogen Atmosphere Ammonia Furnace Surface Layer 
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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Literature cited

  1. 1.
    R. P. Shubin and V. S. Prikhod'ko, Heat Treatment Workshop Technology and Equipment [in Russian], Mashinostroenie, Moscow (1971).Google Scholar
  2. 2.
    A. N. Litovchenko, A. N. Kozlova, and A. V. Saburov, "Effect of furnace atmosphere circulation and method of feeding industrial gases during carburizing in muffleless units", Tekhnol., Avtomobilestr., No. 3, 9–11 (1982).Google Scholar
  3. 3.
    P. P. Emel'yanov, "Injector system for mixing furnace atmosphere during carburizing and carbonitriding of articles", Metalloved Term. Obrab. Met., No. 1, 30–36 (1981).Google Scholar
  4. 4.
    V. I. Shapochkin et al., "Some mechanisms of impregnating surface layers with nitrogen during high-temperature carbonitriding in an endothermic atmosphere,", in: Improving the Reliability and Endurance of Machine Components by Heat and Chemical Heat Treatment Methods [in Russian], Volgograd (1983).Google Scholar
  5. 5.
    B. S. Mastryukov, Thermotechnical Calculations for Industrial Furnaces [in Russian], Metallurgiya, Moscow (1972).Google Scholar
  6. 6.
    E. L. Gyulikhandanov, L. M. Semenova, and V. I. Shapochkin, "Effect of high-temperature carbonitriding on the structure, phase composition, and properties of low-alloy steels", Metalloved. Term. Obrab. Met., No. 4, 10–14 (1984).Google Scholar

Copyright information

© Plenum Publishing Corporation 1987

Authors and Affiliations

  • V. I. Shapochkin
  • A. V. Pozharskii
  • L. Ya. Kashcheev

There are no affiliations available

Personalised recommendations