Issues »  Volume 36, Issue 4

Dependence of the Critical Temperature Magnitude at Impact Toughness Tests on the Parameters of the Microstructure of Martensitic Low-Carbon Steels

S. O. Kotrechko, Yu. Ya. Meshkov, R. V. Telyovych, V. M. Grishchenko

G.V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03680 Kyiv-142, Ukraine

Received: 13.02.2014. Download: PDF

The results of studies of the effect of microstructure of low-carbon steels after quenching and tempering on the temperature of a 100%-brittle component of Charpy specimens are presented. Based on the results of uniaxial tensile tests of smooth specimens and dynamic bending tests of Charpy specimens, the value of the effective overstress of a metal in front of the concentrator is obtained at the critical temperature. The range of martensitic-packet sizes, for which the size of carbide particles controls the Charpy temperature, is specified. The requirements to sizes of carbide particles, at which the increase in strength of steel is not accompanied by the increase of temperature of a 100%-brittle component, are formulated.

Key words: brittleness, ductility, ductile-to-brittle transition, martensitic steel, Charpy specimens, low-carbon steels.

URL: http://mfint.imp.kiev.ua/en/abstract/v36/i04/0461.html

DOI: https://doi.org/10.15407/mfint.36.04.0461

PACS: 62.20.D-, 62.20.F-, 62.20.fk, 62.20.M-, 62.20.me, 62.20.mj, 81.30.Kf

Citation: S. O. Kotrechko, Yu. Ya. Meshkov, R. V. Telyovych, and V. M. Grishchenko, Dependence of the Critical Temperature Magnitude at Impact Toughness Tests on the Parameters of the Microstructure of Martensitic Low-Carbon Steels, Metallofiz. Noveishie Tekhnol., 36, No. 4: 461—476 (2014) (in Ukrainian)

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