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Metal Science and Heat Treatment

, Volume 27, Issue 4, pp 267–271 | Cite as

Hardening of gray irons in surface chilling with a low-temperature plasma

  • D. S. Stavrev
  • N. Ya. Nikov
Heat Treatment with the Use of Highly Concentrated Energy Sources
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Conclusions

  1. 1.

    By plasma surface fusion in gray irons with lamellar and spheroidal graphite it is possible to obtain a hardened case with a hardness of not less than 580–600 HV and a structure characterized by high inhomogeneity, which consistas basically of quasiledeburite, cementite, carbides, martensite, residual austenite, bainite, sorbite, and graphite in various ratios and quantities depending upon the form of the iron and the treatment conditions.

     
  2. 2.

    The best quality of hardened layer is observed in irons with spheroidal and lamellar graphite with a carbon equivalent of 3.5–3.7 with a case thickness of not more than 1.2–1.5 mm, a preheat temperature of 400°C, and a ratio of vp/tp=(10–20)·10−6 cm/(sec·deg).

     

Keywords

Graphite Carbide Austenite Martensite Cementite 
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.
    G. Sh. Kirya, Yu. K. Bunina, and L. Kh. Ivanova, "Surface hardening of gray iron by induction fusion" Metalloved. Term. Obrab. Met., No. 5, 58–59 (1982).Google Scholar
  2. 2.
    F. Emde, "Umschmelzharten von Nockenwellen aus Granguß," Elektrowarme International,37, 1979/B, June.Google Scholar
  3. 3.
    R. P. Todorov, Graphitized Iron-Carbon Alloys [in Russian], Metallurgiya, Moscow (1981).Google Scholar

Copyright information

© Plenum Publishing Corporation 1985

Authors and Affiliations

  • D. S. Stavrev
  • N. Ya. Nikov

There are no affiliations available

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