Conclusions
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1.
The critical case hardening rate in relation to chemicothermal treatment and type of steel may vary over a wide range from 2–330 deg/sec.
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2.
By comparing the data obtained with critical hardening rates for different steels it becomes possible to select steel type and chemicothermal procedure for gears with different modules. It is possible not only to ensure the required hardness at a tooth working surface, but also the required hardness at the surface of a tooth space and at a depth corresponding to the effective case thickness both in the area of the working surface and in the area of the tooth space (in existing methods for controlling case quality the last three parameters are not generally checked and may not be guaranteed).
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Additional information
Moscow Automotive Mechanics Institute, Scientific-Research Institute of Automobile Industry Technology Moscow. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 2–9, March, 1981.
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Kozlovskii, I.S., Olovyanishnikov, V.A. & Zinchenko, V.M. Criteria for evaluating the quality and bases for rational selection of carburized and nitrided steels. Met Sci Heat Treat 23, 149–177 (1981). https://doi.org/10.1007/BF00769603
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DOI: https://doi.org/10.1007/BF00769603