Conclusions
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1.
During prolonged operation at elevated temperatures and pressures the substructure of deformed steel Kh18N12T is stabilized by dispersed particles of titanium carbide. As the result of the stable substructure, the deformability of the steel decreases during long-term operation.
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2.
In austenitic chromium—nickel steels alloyed with titanium, recrystallization is inhibited at temperatures of intensive decomposition of the solid solution with formation of dispersed carbides.
Heat treatment at these temperatures (980–1050° for steel Kh18N12T) does not reliably improve the long-term plasticity.
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3.
Heat treatment inducing primary recrystallization of strain hardened chromium—nickel austenitic steel alloyed with titanium ensures the necessary deformability.
Normalization at 1120–1150° is the optimal heat treatment for steel Kh18N12T.
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Literature cited
A. V. Stanyukovich, Brittleness and Plasticity of Heat Resistant Materials [in Russian], Metallurgiya, Moscow (1967).
I. Dedien, Revue de Metallurgie,62, No. 3 (1965).
Additional information
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 67–68, June, 1972.
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Berezina, T.G., Mints, I.I., Kozlova, R.P. et al. The durability of superheater tubing of steel Kh18N12T. Met Sci Heat Treat 14, 546–548 (1972). https://doi.org/10.1007/BF00648319
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DOI: https://doi.org/10.1007/BF00648319