Conclusions
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1.
The controlled atmospheres obtained during the combustion of natural gas in the prototype furnace with fluidized bed at α≤0.45 sharply reduce oxidation and decarburization during the heating of alloy steels to 900–1000°C. In a carefully controlled furnace no decarburization of the surface layer takes place.
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2.
The heating of steels takes place in a fluidized bed at a considerably higher rate than in an electric furnace so that the heating time for hardening decreases in a ratio of 12∶1 and for tempering in the ratios 8∶1.
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3.
The hardening ability of a fluidized bed is the same as that of oil.
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4.
Mechanical properties and hardness of 18Kh2N4VA and 40KhNVA steels heat treated in a fluidized bed are stable and meet the specified requirements.
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5.
High-speed heat treatment in a fluidized bed without oxidation or decarburization of parts is recommended for use in industry.
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Literature cited
A.P. Baskakov, High-Speed Oxidation-Free Heating and Heat-Treatment in Fluidized Bed [in Russian], Metallurgiya, Moscow (1968).
Baskakov et al., in: Materials in Industrial Thermodynamics [in Russian], Ukrainian Polytechnical Institute, Sverdlovsk (1967).
V.F. Kopytov, Heating of Steel in Furnaces [in Russian], Metallurgizdat, Moscow (1955).
N.N. Varygin, MiTOM, No. 6 (1961).
Additional information
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 11–16, June, 1971.
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Vinokurov, V.A., Pumpyanskaya, T.A., Onokhin, V.F. et al. Heat treatment in a fluidized bed furnace. Met Sci Heat Treat 13, 457–461 (1971). https://doi.org/10.1007/BF00656939
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DOI: https://doi.org/10.1007/BF00656939