Conclusions
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1.
Heating of steel parts in a high-temperature induction salt bath with a graphite crucible results not only from the heat from the surrounding fused salts but also from the electromagnetic field that occurs in the crucible.
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2.
The heating curves for steel parts in induction and electrode salt baths are of the same shape in the initial and middle sections. A difference in the curves is observed in the last stage of heating. In an induction salt bath the temperature in the center of the piece reaches the temperature of the fused salts, while in an electrode salt bath it remains 10–15° below the temperature of the fused salts.
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3.
The through heating time for steel parts is 30–50% smaller in an induction salt bath with a graphite crucible than in an electrode salt bath.
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4.
The effect of preliminary heating and the temperature of the salts is the same in both baths — the through heating time decreases as they increase.
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5.
The through heating time for samples of steels R6M5, R12, and R18 is practically the same with an identical temperature of the fused salts.
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Additional information
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 10, pp. 17–21, October, 1976.
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Smol'nikov, E.A., Simonenko, A.N. Kinetics of induction heating of steel parts in a salt bath with a graphite crucible. Met Sci Heat Treat 18, 856–860 (1976). https://doi.org/10.1007/BF00705189
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DOI: https://doi.org/10.1007/BF00705189