Conclusions
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1.
Steel 20K with a Widmanstatten structure has higher strength and plastic characteristics as well as a higher impact strength than the steel with a granular ferritic-pearlitic structure.
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2.
At the same grain size the cold brittleness threshold of steel 20K with a Widmanstatten structure is 25–30°C below that of the steel with a granular structure.
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3.
The higher mechanical properties of the steel with a Widmanstatten structure are due to the fincgrained structure of the ferrite and the higher percentage of quasieutectoid.
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4.
The acicular form of ferrite in the microstructure of the steel cannot be the reason for lower mechanical properties.
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Literature cited
F. Erdmann-Jesnitzer and B. Schellhorn, Industrieblatt, No. 3 (1959).
R. E. Mazel', Teploénergetika, No. 1 (1958).
M. A. Guzovskaya and A. P. Gulyaev, Special Steels and Alloys, Transactions of the Central Scientific Research Institute of Ferrous Metallurgy [in Russian], No. 35, Metallurgizdat, Moscow (1963).
B. A. Leont'ev, Fiz. Metal. i Metalloved.,16, No. 4 (1963).
Additional information
Zhdanov Metallurgical Institute. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 11, pp. 76–79, November, 1968.
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Leont'ev, B.A., Buzovskii, Y.N. Mechanical properties of steel with a Widmanstatten structure. Met Sci Heat Treat 10, 930–932 (1968). https://doi.org/10.1007/BF00649231
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DOI: https://doi.org/10.1007/BF00649231