| Autor: |
Aksenova, K. V., Gromov, V. E., Vashchuk, E. S., Ivanov, Yu. F. |
| Zdroj: |
Inorganic Materials: Applied Research; Apr2024, Vol. 15 Issue 2, p426-431, 6p |
| Abstrakt: |
Using the methods of scanning and transmission electron microscopy, an analysis was made of the evolution of the structure and defective substructure of rail steel under uniaxial compression up to a degree of 50%. It is revealed that the strain hardening has a multistage nature and is accompanied by a decrease in the scalar and excess dislocation density and fragmentation of pearlite grains, which increases with increasing strain. Fracture of cementite plates proceeding through the mechanisms of their dissolution and cutting by mobile dislocations is revealed. On the basis of data on the structural-phase states and the defective substructure of rail steel obtained by the methods of modern physical materials science, a quantitative analysis of the mechanisms of hardening of rail steel at degrees of compression deformation of 15, 30, and 50% was carried out. It is shown that, at the initial stage (ε = 15%), the main strengthening factor of the steel under study is the presence of lamellar pearlite grains, and at high degrees of deformation (ε = 50%), it is hardening by incoherent particles of the carbide phase. The overall yield strength of steel was estimated in the first approximation based on the additivity principle, which assumes the independent action of each of the hardening mechanisms. A good qualitative agreement between the experimentally obtained and theoretically calculated values of steel strength has been revealed. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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