Conclusions
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1.
Vacuum annealing reduces hydrogen embrittlement of alloy OT4-1.
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2.
The resistance to repeated static loading of samples with stress concentrators is improved by vacuum annealing of alloy OT4-1.
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3.
To reduce the hydrogen content in finished parts we recommend the use of vacuum annealing at 670° C for 2 h and subsequent oxidation of the surface of plates by admitting air into the system at 300–400° C.
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4.
On the surface of plates after vacuum annealing of alloys OT4 and OT4-1 at 1000–1100° C there are steps, the majority of them five-sided. This is due to the imperfect shape of the polycrystals constituting the metal.
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Literature cited
V. A. Livanov et al., Hydrogen in Titanium [in Russian], Metallurgizdat, Moscow (1962).
N. M. Pul'tsin and V. B. Pokrovskaya, Izv. Vuzov, Tsvetnaya Metallurgiya, No. 2 (1963).
R. Jaffee, J. Science,152 (1966).
M. Déchamps et al., J. Metaux (Corrosion),44, No. 517 (1968).
Additional information
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 6–10, May, 1972.
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Kolachev, B.A., Gorshkov, Y.V., Shevchenko, V.V. et al. Structure and properties of alloys OT4 and OT4-1 after vacuum annealing. Met Sci Heat Treat 14, 378–381 (1972). https://doi.org/10.1007/BF00649814
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DOI: https://doi.org/10.1007/BF00649814