Conclusions
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1.
A mechanism is suggested for the formation of coatings by diffusion metallization.
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2.
On the basis of the distribution of nickel [2], measurements of the thickness of the coating, and examination of the microstructure it was found that the coatings consist of a built up diffusion layer and a diffusion layer proper. The thickness of the built up layer was 32 μ on steel Kh18N9 and 35 μ on steel KhN35VT coated at 1100° for 10 h, and the thickness of the diffusion layer proper was 88 and 25 μ respectively.
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3.
The distribution of nickel in the chromium coating on austenitic steels is due to diffusion of nickel from the depth of the sample into the built-up layer.
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4.
The use of burnishing after chromizing reduces the surface roughness and increases surface hardness.
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Literature cited
B. Prenosil, Anti-Corr. Meth. and Mater.,15, 10 (1968).
A. V. Smirnov et al., in: Heat Resistant and Thermally Stable Coatings [in Russian], Nauka, Moscow (1969).
P. Cralmiche, Rév. Metallurgie,47, 3 (1950).
P. Tielmann, Proc. ASTM,40 (1940).
Yu. N. Griboedov, Metal. i Term. Obrabotka Metal., 10 (1965).
Yu. G. Shneider, Cold Treatment of Precision Parts under Pressure [in Russian], Mascow-Leningrad (1956).
Additional information
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 8, pp. 58–60, August, 1973.
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Smirnov, A.V., Chemrukova-Boradaeva, É.N. & Nachinkov, A.D. Thermodiffusion chromizing of austenitic steels. Met Sci Heat Treat 15, 694–696 (1973). https://doi.org/10.1007/BF00654769
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DOI: https://doi.org/10.1007/BF00654769