Conclusions
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1.
We investigated the effect of preliminary quenching on spheroidizing of carbides. It was found that preliminary quenching greatly accelerates spheroidizing of carbides and can be made part of the spheroidizing treatment.
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2.
For previously quenched steel the austenitizing temperature and time must be selected so that a substantial percentage of the granular carbides remains undissolved. The cooling time or isothermal holding temperature below Ac1 after austenitizing of the quenched steel must prevent formation of lamellar carbides.
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3.
The spheroidizing treatment proposed not only shortens the spheroidizing time but improves the properties of parts after final heat treatment.
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4.
This new treatment is recommended for use where it is economically expedient.
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Literature cited
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Additional information
Dnepropetrovsk Metallurgical Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 27–31, March, 1975.
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Dolzhenkov, I.E., Lotsmanova, I.N. Effect of preliminary quenching on spheroidization of carbides. Met Sci Heat Treat 17, 211–214 (1975). https://doi.org/10.1007/BF00663682
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DOI: https://doi.org/10.1007/BF00663682