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Effects of Ni, Co and heat treatment on the structure and characteristics of VKS6 steel

  • Construction Steels
  • Published:
Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    The steels of the 9Ni-4Co (VKS6) type after tempering within the 530°C–560°C range possess high stress-corrosion resistance, fatigue resistance, low notch sensitivity and good impact toughness within an extensive temperature range. After low-temperature tempering these steels have no advantages in comparison with an economically alloyed 30KhGSN2A steel.

  2. 2.

    To restrict the VKS6 residual austenite content to 3–5%, and to make it responsive to isothermal quenching, the steels' Ni content should be limited to 7–8% and it must be subjected to chilling. At higher residual austenite contents both the tensile strength and the impact toughness deteriorate, especially at low temperatures, due to the residual austenite transformation into untempered martensite during deformation.

  3. 3.

    The VKS6 steel is practically immune to temper brittleness. It preserves its high service characteristics after prolonged heating at 550°C, and therefore can be used as a heat-resistant steel for parts working at temperatures up to 550°C.

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Literature cited

  1. R. K. Guseinov and V. N. Zikeev, "Medium-carbon structural steels with high tensile strength and toughness, alloyed with 9% Ni and 4% Co", Metalloved. Term. Obrab. Met., No. 1, pp. 49–54 (1974).

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  2. A. P. Gulyaev, V. N. Zikeev, and R. K. Guseinov, "Effect of Ni and Co on high-strength, medium-carbon steel", Metalloved. Term. Obran. Met., No. 2, pp. 2–8 (1975).

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  3. A. P. Gulyaev, V. N. Zikeev and R. K. Guseinov, "Alloying effect of Mo, V, and N on steel 30N9K4", Metalloved. Term. Obrab. Met., No. 3, pp. 2–7 (1977).

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  4. N. G. Orekhov, E. B. Chabina, L. N. Belyakov and N. G. Pokrovskaya, "Impurity segregation in Ni-Cr-Mo steels, and its influence on fracture characteristics," in: Proceedings of All-Union Science-Technical Conference on Intercrystalline Brittleness in Steels and Alloys [in Russian], Izhevsk (1984), pp. 33–34.

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Authors
  1. A. F. Petrakov
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  2. A. P. Gulyaev
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  3. N. G. Pokrovskaya
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  4. L. N. Belyakov
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  5. V. N. Zikeev
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  6. N. I. Ostroukhova
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Additional information

All-Union Institute of Aviation Materials (VIAM). I. P. Bardin Central Scientific-Research Institute of Ferrous Metals (TsNIIChERMET). Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 15–19, December, 1985.

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Petrakov, A.F., Gulyaev, A.P., Pokrovskaya, N.G. et al. Effects of Ni, Co and heat treatment on the structure and characteristics of VKS6 steel. Met Sci Heat Treat 27, 892–897 (1985). https://doi.org/10.1007/BF00700096

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  • DOI: https://doi.org/10.1007/BF00700096

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