Conclusions
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1.
As the result of carbonitriding the hardness of high speed samples increases an average of HV 200–300.
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2.
The optimum carbonitrided case thickness, 0.02–0.03 mm, is reached in 10–15 min for R6M5, R18F, R12F2K8M3, and R12F3 steels and in 20–25 min for R6M5K5 and R9M4K8 steels.
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3.
After carbonitriding cutting tool life increases by three to four times.
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4.
The carbonitriding process does not require complex equipment and makes it possible to obtain a high rate of heating and to decrease thermal stresses and warping of the tool.
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Literature cited
Yu. M. Lakhtin and Ya. D. Kogan, Nitriding of Steel [in Russian], Mashinostroenie, Moscow (1967).
A Feature of Heat Treatment of R6M5, R6M5K5, and R9M4K8 High Speed Steel Tools. Express Information [in Russian], No. 4, Series 1008, Tsent. Nauch.-Issled. Inst. Inf. Tekh.-Ekonom. Issled. Min. Zagot. SSSR (1977).
Additional information
Kamaz Truck Plant. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 23–25, June, 1982.
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Gesser, L.E., Sagitova, S.R. & Liberman, L.S. Influence of carbonitriding on the life of cutting tools. Met Sci Heat Treat 24, 399–402 (1982). https://doi.org/10.1007/BF00780443
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DOI: https://doi.org/10.1007/BF00780443