Conclusions
-
1.
to obtain a satisfactory distribution of cooling rates in PK-2 media, it is necessary to observe the following procedure for medium preparation prior to quenching; aging of the concentrate by immersing heated metal in the bath to raise the temperature of the solution for a brief time almost to its boiling point, the addition of water to the solution to the required concentration, and then an alkali to achieve a pH=6–7.
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2.
The cooling capacity of PK-2 solutions depends on their concentration; at temperatures of less than 400°C for solutions of any concentration, the cooling rate in the PK-2 medium is significantly higher than that in quenching oil.
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3.
The cooling capacity of the PK-2 quenching medium is determined to a large degree by the temperature of the bath. It is necessary to specify an effective cooling system for the quenching medium to prevent unfavorable consequences of a high-temperature bath.
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Additional information
Ural Polytechnic Institute. Ural Scientific-Research Institute of Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 11, pp. 19–23, November, 1990.
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Eismondt, Y.G., Zakharov, A.V., Gol'dshtein, M.I. et al. Problem of preparing aqueous PK-2 solutions for use as quenching media. Met Sci Heat Treat 32, 829–834 (1990). https://doi.org/10.1007/BF00700061
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DOI: https://doi.org/10.1007/BF00700061