Conclusions
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1.
Quenching from 820°C, usually recommended for maraging steels, does not make it possible to obtain the optimal properties for steel N14Kh5M3TYu. The highest ductility and toughness are attained by quenching from 950–980°C.
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2.
The optimal combination of strength, ductility, and toughness results from quenching from these temperatures and aging at 480–520°C.
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3.
Repeated aging results in an additional increase of the strength beginning at temperatures of 300°C and continuing up to the primary aging temperature (480–520°C), which may be due to some differences in the kinetics and composition of precipitates that depend on the original condition of the solid solution before aging.
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Literature cited
D. Peters, Trans. AIME,243, No. 12 (1967).
D. Gorn, J. of Metals,16, No. 10 (1964).
M. D. Perkas and V. M. Kardonskii, High-Strength Maraging Steels [in Russian] (1970).
Additional information
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 11–14, March. 1972.
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Prokhorov, P.A., Larichev, Y.A. & Goncharov, A.F. Mechanical properties of steel N14Kh5M3TYu after heat treatment. Met Sci Heat Treat 14, 197–199 (1972). https://doi.org/10.1007/BF00690761
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DOI: https://doi.org/10.1007/BF00690761