Conclusions
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1.
Chemicothermal treatment substantially increases the surface hardness of economically alloyed maraging steel 04Kh2N5MFYu.
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2.
The use of steel 04Kh2N5MFYu makes it possible to reduce the nitriding, chromizing, and boriding times by a factor of three in comparison with similar processes for standard steels. The possibility of using slower cooling to obtain a martensitic structure and the formation of lamellar low-carbon martensite greatly reduce the tendency of the boride layer to crack.
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3.
The secondary hardening effect is observed in tempering at 500–560° after carburizing and quenching of steel 04Kh2N5MFYu, which permits the use of high-temperature tempering after carburizing and quenching.
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4.
After chromizing, the diffusion coating consists of alloyed ferrite, which is hardened by precipitation hardening in the course of aging.
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Literature cited
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Additional information
Zhdanov Metallurgical Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 9, pp. 36–38, September, 1979.
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Malinov, L.S., Korotich, I.K. Chemicothermal treatment of economically alloyed maraging steels. Met Sci Heat Treat 21, 701–703 (1979). https://doi.org/10.1007/BF00708634
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DOI: https://doi.org/10.1007/BF00708634