Conclusions
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1.
Steel ÉP817 quenched from 1000° (1 h)+cold treatment at−70° for 2 h+aging at 510° for 3 h has a better combination of physical and mechanical properties than steel VNS-2 quenched from 1000° (1 h) and aged at 410–450° for 3 h.
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2.
Heating in the range of 400–450° induces, along with aging, destabilization of retained austenite, which is accompanied by local stresses. This has a substantial effect on the technological and operational reliability of the steel.
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Literature cited
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Additional information
Znamya Truda Moscow Machine Construction Factory, I. P. Bardin Central Scientific-Research Institute of Ferrous Metallurgy. N. E. zhukov Military Engineering Academy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 4, pp. 49–51, April, 1983.
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Bendryshev, O.L., Alekseev, V.V., Silina, V.I. et al. Properties of maraging steels VNS-2 and ÉP817 after aging. Met Sci Heat Treat 25, 304–308 (1983). https://doi.org/10.1007/BF00778329
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DOI: https://doi.org/10.1007/BF00778329