We have investigated the influence of a liquid-metal medium on the mechanical properties of 20Kh13 ferritic–martensitic steel in the temperature range 300–600°С. It is shown that lead and lead−bismuth eutectic melts facilitate a decrease in the ultimate strength of 20Kh13 steel by 10–20% against that in vacuum, and with increase in temperature, this effect is enhanced. We have found the influence of the liquid-metal medium on the plastic deformability of 20Kh13 steel at elevated temperatures. It has been established that 20Kh13 steel is susceptible to liquid-metal embrittlement in the temperature range 350–450°С, which manifests itself weaker in lead and more substantially in the lead−bismuth eutectic. The decrease in the percentage elongation against that in vacuum depends on the medium: it is equal to 11% in Pb at a temperature of 450°С, and ranges from 15 to 30% in the Pb−Bi eutectic melt in the temperature range 350−400°С.
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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 48, No. 3, pp. 46–52, May–June, 2012.
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Yas’kiv, O.І., Fedirko, V.M. Influence of lead and Pb−Bi eutectic melts on the mechanical properties of 20Kh13 ferritic–martensitic steel. Mater Sci 48, 308–315 (2012). https://doi.org/10.1007/s11003-012-9507-9
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DOI: https://doi.org/10.1007/s11003-012-9507-9