Conclusions
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1.
During heating of steel 1Kh21N5T up to 1 h at 450–550°C local hardening of the metal is possible due to ordering of the solid solution of ferrite, which is manifest in the formation of dislocation pairs.
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2.
An elevated titanium concentration facilitates the decomposition of austenite at 550–650°C and the formation of new sections of α-phase and precipitation hardening by titanium carbides, which induces additional embrittlement.
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3.
The possible causes of embrittlement are the films of precipitates in the grain boundaries and the finely dispersed particles in the grains and on dislocations.
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4.
Embrittlement of the steel can be reduced by low-temperature (∼850°C) deformation, which produces a fragmented structure of austenitic components that is thermally stable during tempering.
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Literature cited
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Additional information
Zlatoust Metallurgical Plant. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 11, pp. 25–27, November, 1968.
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Burnakov, K.K., Brazgin, I.A. Embrittlement of steel 1Kh21N5T. Met Sci Heat Treat 10, 874–877 (1968). https://doi.org/10.1007/BF00649213
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DOI: https://doi.org/10.1007/BF00649213