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Effect of restoration vacuum heat treatment on the structure, phase composition, and properties of alloy ZhS6U

  • High-Temperature Steels And Alloys
  • Published:
Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    During stress-rupture testing and also during operation of components of high-strength alloy ZhS6U there is a change in its structure and phase composition, an increase in dislocation density, ϒ ′2 particles coalesce, and secondary highly dispersed precipitates of it form. Lamination of ϒ′ into fractions ϒ 11 and ϒ ′2 is observed, differing in chemical composition (predominantly for the titanium, tungsten, and molybdenum content). The quantitative ratio of fractions in the alloy is determined by the test temperature and applied stress. Simultaneously there is intense formation of M6C carbide.

  2. 2.

    Structural and phase changes are overcome partly or completely by restoration vacuum heat treatment.

  3. 3.

    On achieving a critical dislocation density (ρ=7·109 cm−2) microcracks may generate along grain boundaries, as a result of which restoration of operating capacity for the alloy becomes impossible.

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Literature cited

  1. É. V. Polyak, L. P. Sorokina, and M. P. Usikov, “Fine structure of alloys based on nickel-chromium and their heat resistance”, in: Structural and High-Temperature Materials for New Technology [in Russian], Nauka, Moscow (1978).

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  2. N. S. Gerchikova, S. T. Kishkin, É. V. Polyak, et al., Study of the Fine Structure of High-Temperature Alloys and Steels [in Russian], Metallurgiya, Moscow (1969).

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  3. N. F. Lashko, L. V. Zaslavskaya, M. N. Kozlova, et al., Physicochemical Phase Analysis of Steels and Alloys [in Russian], Metallurgiya, Moscow (1978).

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Authors
  1. L. P. Sorokina
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  2. G. I. Morozova
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  3. M. B. Bronfin
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Additional information

Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 4, pp. 40–43, April, 1987.

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Sorokina, L.P., Morozova, G.I. & Bronfin, M.B. Effect of restoration vacuum heat treatment on the structure, phase composition, and properties of alloy ZhS6U. Met Sci Heat Treat 29, 294–298 (1987). https://doi.org/10.1007/BF00769429

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  • DOI: https://doi.org/10.1007/BF00769429

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