Conclusions
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1.
Steel Kh20N20 alloyed with up to 5% Si is not embrittled on tempering up to 10 h. With 6% Si the steel is embrittled in 1 h.
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2.
The embrittlement of steel Kh20N20 with 6% Si and steel Kh20N20 with more than 4% Si on prolonged tempering (over 100 h) is evidently due to the precipitation of an intermetallic phase enriched in silicon.
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Additional information
Central Scientific Research Institute of Ferrous Metallurgy. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 11, pp. 22–24, November, 1968.
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Novokshchenova, S.M., Babakov, A.A. Effect of silicon on temper brittleness of chromium-nickel steel of the Kh20N20 type. Met Sci Heat Treat 10, 870–872 (1968). https://doi.org/10.1007/BF00649212
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DOI: https://doi.org/10.1007/BF00649212