Improvement of Structure and Mechanical Characteristics of Hot-Rolled Eutectoid Steel by Means of High-Speed Heat Treatment

R. V. Teliovich$^{1}$, J. A. Garasym$^{1}$, H. V. Krechkovska$^{2}$, N. O. Bondarevska$^{1}$

$^{1}$G. V. Kurdyumov Institute for Metal Physics, NAS of Ukraine, 36 Academician Vernadsky Blvd., UA-03142 Kyiv, Ukraine
$^{2}$G. V. Karpenko Physico-Mechanical Institute, NAS of Ukraine, 5 Naukova Str., 79060 Lviv, Ukraine

Received: 05.07.2018. Download: PDF

The changes in structure and mechanical properties of hot-rolled eutectoid steel (0.76% C, 0.79% Mn, 0.32% Si) are studied after additional high-speed electrothermal treatment—normalization or quenching with high-temperature tempering. Steel after high-speed heating to 820°C was cooled at different rates to obtain pearlite structures or a mixture of the upper and lower bainites and tempered martensite. Such additional heat treatment improves the complex of mechanical properties of hot-rolled steel, most effectively after the formation of the bainitic structure. As found, the destruction of high-released steel after impact tests and static fracture toughness is accompanied by delamination with the propagation of a crack in a plane parallel to the rolling plane. This leads to anisotropy of the toughness. The static fracture toughness $K_{1\textrm{c}}$ of steel is slightly changing, depending on the orientation of the plane of fracture of the samples relative to the rolling plane, and its values remain at a sufficiently high level.

Key words: eutectoid steel, high-speed electrothermal treatment, mechanical characteristics under tension, impact strength, static crack resistance, anisotropy.

URL: http://mfint.imp.kiev.ua/en/abstract/v40/i11/1489.html

DOI: https://doi.org/10.15407/mfint.40.11.1489

PACS: 61.72.Ff, 62.20.F-, 62.20.M-, 81.20.Hy, 81.40.Ef, 81.40.Lm, 83.50.Uv

Citation: R. V. Teliovich, J. A. Garasym, H. V. Krechkovska, and N. O. Bondarevska, Improvement of Structure and Mechanical Characteristics of Hot-Rolled Eutectoid Steel by Means of High-Speed Heat Treatment, Metallofiz. Noveishie Tekhnol., 40, No. 11: 1489—1508 (2018) (in Ukrainian)


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