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Metal Science and Heat Treatment

, Volume 18, Issue 7, pp 578–582 | Cite as

Oxidation resistance of Ni+10% Cr alloy with additions of silicon, zirconium, hafnium, or rare earth metals

  • M. M. Ryabkina
  • I. L. Rogel'berg
Heat-Resistant Steels and Alloys

Conclusions

  1. 1.

    Alloying of Ni-10% Cr with silicon along with small amounts of zirconium, hafnium, or REM leads to a sharp increase in the oxidation resistance of the alloy during isothermal and thermal cycling tests.

     
  2. 2.

    Small additions of hafnium, zirconium, lanthanum, or samarium to Ni-10% Cr-1.8% Si increase the time to failure several times in thermal cycling tests. The effect of these additions on the oxidation resistance of the alloy is negligible during isothermal oxidation, but increases with temperature in the range of 1000–1200°.

     
  3. 3.

    The increase in the oxidation resistance of Ni-10% Cr when alloyed with silicon along with zirconium, hafnium, or REM is due to formation of a protective layer of SiO2 in the scale and to good adherence of the scale to the alloy, ensured by precipitation of oxides of the second alloying element in the grain boundaries of the alloy beneath the scale.

     

Keywords

Oxidation Precipitation Silicon SiO2 Zirconium 
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.
    B. Lustman, Trans. Met. Soc. AIME,188, 995 (1950).Google Scholar
  2. 2.
    L. P. Zhukov and I. M. Plemyannikova, "Compositions of the scale and oxidation resistance of Ni−Cr−Si alloys with different microaddition," in: Precision Alloys [in Russian], No. 78, TsNIIChM, Metallurgiya, Moscow (1968), p. 163.Google Scholar
  3. 3.
    S. N. Grazhdankin et al., "Effect of microadditions on oxidation resistance of alloy Kh20N80," in: Theory and Practice of Metallurgy [in Russian], No. 10, Chelyabinsk, (1969), p. 86.Google Scholar
  4. 4.
    M. M. Ryabkina, I. S. Gil'dengorn, and I. L. Rogel'berg, "Processes of oxidation in air of Ni+10% Cr alloyed with Zr and Hf," Zashchita Metal.,10, No. 6, 734 (1974).Google Scholar
  5. 5.
    M. M. Ryabkina and I. L. Rogel'berg, "Processes of oxidation in air of Ni+10% Cr alloyed with rare earth metals," Zaschita Metal.,11, No. 4, 441 (1975).Google Scholar

Copyright information

© Consultants Bureau 1976

Authors and Affiliations

  • M. M. Ryabkina
  • I. L. Rogel'berg

There are no affiliations available

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