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Structural transformations in aluminum-coated and chromium-coated steel Kh25N20S2

  • Chemicothermal Treatment
  • Published:
Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    In the original condition the aluminum coating on steel Kh25N20S2 consists mainly of aluminides of the (Fe, Ni)Al type with a bcc lattice and a small amount of σ phase precipitated from the solid solution in the process of slow cooling from the deposition temperature (1000°).

  2. 2.

    This structure is due to impoverishment of the coating in nickel, which diffuses toward aluminum, and enrichment in silicon, chromium, and iron, which are driven into austenite by aluminum.

  3. 3.

    During high-temperature oxidation the quantity of aluminides rich in aluminum decreases in the surface layer, with formation of austenite in the final stage. α-Al2O3 is formed on the surface, and nitrides in the presurface zone, accelerating destruction of the coating.

  4. 4.

    In the original condition the chromium coating on steel Kh25N20S2 consists of chromium, Cr23C6, and σ phase (FeCr) alloyed with nickel and silicon and resistant at 1000°.

  5. 5.

    Oxidation in air leads to formation of Cr2N along with Cr2O3; the quantity of Cr23C6 in the coating increases.

  6. 6.

    Chromizing is recommended to improve the oxidation resistance of steel Kh25N20S2 alloyed with nitrogen.

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Literature cited

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Authors
  1. L. F. Belyak
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  2. G. N. Kartmazov
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  3. V. S. Kogan
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  4. T. V. Kostritsa
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  5. É. P. Krivchikova
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Additional information

Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 41–46, March, 1978.

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Belyak, L.F., Kartmazov, G.N., Kogan, V.S. et al. Structural transformations in aluminum-coated and chromium-coated steel Kh25N20S2. Met Sci Heat Treat 20, 217–221 (1978). https://doi.org/10.1007/BF00777097

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  • DOI: https://doi.org/10.1007/BF00777097

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