Summary
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1.
An increase in the concentration of titanium above 0.5% in Kh27G21N15T steel leads to the formation of a new excess phase which appears to be a phase of the χ-type. Further increase in the concentration of titanium leads to an increase in the amount of the new phase in the steel. This phase is nonmagnetic and has a microhardness 2–3 orders higher than that of the austenite base.
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2.
The new excess phase sharply decreases the ductility of the steel, and particularly the resilience, but heat treatment (heating to 1150°C, remaining 4 h at this temperature, and cooling in air) dissolves this phase. As the result, the high ductility and resilience are restored.
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Additional information
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 24–26, December, 1965
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Lupakov, I.S., Vasil'ev, N.A. A new excess phase in Cr−Mn−Ni−Ti steel. Met Sci Heat Treat 7, 800–802 (1966). https://doi.org/10.1007/BF00666969
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DOI: https://doi.org/10.1007/BF00666969