Conclusions
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1.
Stell 0Kh20N9S2BGTYu has two temperature ranges of embrittlement \t-450–650\dgC and 700–850\dgC. In the high-temperature range \gs phase is formed.
In the low-temperature range there is precipitation hardening of the ferritic component. At 500–550°C holding for 5 min results in substantial hardening and a reduction of plasticity, and therefore the temperature of the molten alkali used in pickling should not exceed 420°C.
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2.
The electron microscopic examination of the samples tempered in the embrittling low-temperature range showed precipitates of intermetallic phase with an ordered cubic structure coinciding crystallographically with the lattice of the matrix (\ga solid solution) but with a lattice parameter (5.7 \0A) double that of the matrix.
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Literature cited
I. Ya. Sokol, Metal. i Term. Obrabotka Metal., No. 12 (1965).
H. Markus, J. Peistrup, and M. Fine, ASM Trans. Quart.,58 (1965).
V. M. Kardonskii and M. D. Perkas, Metal. i Term. Obrabotka Metal., No. 3 (1965).
V. B. Spirodonov, Yu. A. Skakov, and V. N. Iordanskii, Metal. i Term. Obrabotka Metal., No. 3 (1965).
Additional information
Hammer and Sickle Plant. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 41–44, March, 1969.
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Liberman, E.É., Sokol, I.Y. The nature of hardening and embrittlement of steel 0Kh20N9S2BGTYu. Met Sci Heat Treat 11, 206–208 (1969). https://doi.org/10.1007/BF00658734
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DOI: https://doi.org/10.1007/BF00658734