Conclusions
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1.
The red hardness of high-speed steels can be determined from the hardness retained after additional heating at 675°C for 20 or 30 min directly after quenching — criteria RH 67520 and RH 67530 , which give numerically the same values as RH 6204 but require less time. These values can be used together with others (austenite grain size, hardness) to judge the quality.
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2.
In increasing order of red hardness the steels investigated are arranged in the same order in which the alloying of the solid solution changes due to the chemical composition, original structure, and quenching temperature.
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Literature cited
Yu. A. Geller, Tool Steels [in Russian], Metallurgiya, Moscow (1968), p. 63.
A. P. Gulyaev and M. N. Fadyushina, "Red hardness of high-speed steels," in: Methods and Practices in Metallographic Studies of Tool Steels [in Russian], Mashgiz, Moscow (1961).
E. A. Smol'nikov, "How to calculate heating time during quenching," Metal. i Term. Obrabotka Metal., No. 12, 53–65 (1970).
Yu. A. Gorbatsevich and E. A. Smol'nikov, "Marquenching of high-speed steel," Metal. i Term. Obrabotka Metal., No. 2, 2–6 (1973).
A. P. Gulyaev, Properties and Heat Treatment of High-Speed Steel [in Russian], Mashgiz, Moscow (1939), pp. 71–76.
Additional information
All-Union Scientific-Research Tool Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 13–17, June, 1975.
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Smol'nikov, E.A., Orestova, L.M. Red hardness of high-speed steels. Met Sci Heat Treat 17, 467–470 (1975). https://doi.org/10.1007/BF00664173
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DOI: https://doi.org/10.1007/BF00664173