Conclusions
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1.
Nitriding of maraging steel 000Kh12N9D2TM induces the formation of a nonbrittle case as much as 0.2–0.3 mm deep with a high surface hardness (up to HV 900–1000).
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2.
To obtain a case of sufficient depth with a high surface hardness and retain the high strength of the core, nitriding should be conducted at 575°C for 48 h. This results in some reduction of the ultimate strength and negligible reduction of the toughness at +20 and −196°C.
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3.
Nitriding lowers the corrosion resistance somewhat in corrosive atmospheres.
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4.
The combination of high surface hardness and case depth with fairly high toughness of the core makes it possible to recommend nitriding for machine parts of steel 000Kh12N9D2TM operating under conditions of wear at +20 to −196°C.
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Literature cited
M. F. Alekseenko et al., in: Processes for Surface hardening of Machine Parts [in Russian], Nauka, Moscow (1964).
V. D. Yakhnina and M. D. Dvortsin, Metal. i Term. Obrabotka Metal., No. 3 (1967).
Additional information
Moscow Automobile-Highway Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 23–25, June, 1972.
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Lakhtin, Y.M., Tsyrlin, É.S., Shustova, Z.F. et al. Nitriding of maraging steel ÉP699. Met Sci Heat Treat 14, 490–492 (1972). https://doi.org/10.1007/BF00648300
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DOI: https://doi.org/10.1007/BF00648300