Structure and mechanical properties of a high-carbon steel subjected to severe deformation
- Authors: Gorkunov E.S.1, Zadvorkin S.M.1, Goruleva L.S.1, Makarov A.V.1,2, Pecherkina N.L.2
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Affiliations:
- Institute of Engineering Science, Ural Branch
- Mikheev Institute of Metal Physics, Ural Branch
- Issue: Vol 118, No 10 (2017)
- Pages: 1006-1014
- Section: Structure, Phase Transformations, and Diffusion
- URL: https://journals.rcsi.science/0031-918X/article/view/167271
- DOI: https://doi.org/10.1134/S0031918X17100076
- ID: 167271
Cite item
Abstract
The structure and mechanical properties of a high-carbon eutectic steel subjected to the cold plastic deformation by hydrostatic extrusion in a wide range of true strain have been studied. Using scanning and transmission electron microscopy, it has been shown that the formation of cellular, fragmented, and submicrocrystalline structures occurs in the ferritic constituent of the pearlite structure of the steel upon extrusion. This is a consequence of the occurrence of dynamic recovery and continuous dynamic and post-dynamic recrystallization, which cause a decrease in the density of free dislocations at the true strain of more than 1.62. The partial dissolution of the carbide phase is also observed. It has been found that, at a true strain of up to 0.81, the strength properties of the investigated steel are determined mainly by subgrain, dislocation, and precipitation mechanisms of the strengthening; in the deformation range of 0.81–1.62, the role of the grainboundary strengthening increases. At strains above 1.62, grain-boundary strengthening is a prevailing mechanism in the formation of the level of strength properties of the extruded U8A steel. The ultimate tensile strength and yield stress over the entire strain range only uniquely correlate with the density of highangle boundaries; the dependences of the strength characteristics on other structural parameters are not monotonic.
About the authors
E. S. Gorkunov
Institute of Engineering Science, Ural Branch
Email: sherlarisa@yandex.ru
Russian Federation, ul. Komsomolskaya 34, Ekaterinburg, 620049
S. M. Zadvorkin
Institute of Engineering Science, Ural Branch
Email: sherlarisa@yandex.ru
Russian Federation, ul. Komsomolskaya 34, Ekaterinburg, 620049
L. S. Goruleva
Institute of Engineering Science, Ural Branch
Author for correspondence.
Email: sherlarisa@yandex.ru
Russian Federation, ul. Komsomolskaya 34, Ekaterinburg, 620049
A. V. Makarov
Institute of Engineering Science, Ural Branch; Mikheev Institute of Metal Physics, Ural Branch
Email: sherlarisa@yandex.ru
Russian Federation, ul. Komsomolskaya 34, Ekaterinburg, 620049; ul. S. Kovalevskoi 18, Ekaterinburg, 620137
N. L. Pecherkina
Mikheev Institute of Metal Physics, Ural Branch
Email: sherlarisa@yandex.ru
Russian Federation, ul. S. Kovalevskoi 18, Ekaterinburg, 620137