Conclusions
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1.
Diffusion impregnation of steel with boron and silicon followed by sulfur impregnation produced two types of coatings. Coatings of the first type are formed at 1000°C when silicon forces iron boride off the surface, while coatings of the second type are formed at 900°C when silicon to some degree hinders boron diffusion to the surface. Sulfur diffusion does not affect the surface microstructure.
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2.
The wear-resistance and galling-resistance of parts subjected to diffusion impregnation with boron, silicon, and sulfur are 1.6–2.1 times higher than for parts subjected to boron impregnation alone.
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Literature cited
A. V. Kriulin, Sulfidation of Steel and Cast Iron [in Russian], Mashinostroenie, Moscow (1965).
G. V. Borisenok, L. A. Vasil'ev, L. G. Voroshnin, et al., Thermochemical Treatment of Metals and Alloys (Handbook) [in Russian], Metallurgiya, Moscow (1981).
Additional information
Odessa Polytechnical Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 8, pp. 59–60, August, 1985.
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Evtifeev, S.L., Sin'kovskii, A.S. Method of improving the heat resistance of parts working under conditions of discontinuous lubrication. Met Sci Heat Treat 27, 627–629 (1985). https://doi.org/10.1007/BF00699366
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DOI: https://doi.org/10.1007/BF00699366