Year: 2015
Type: article
Abstract: The differential quenching of the rails by compressed air is the most perspective strengthening method. The layer by layer analysis of differentially quenched rails is carried out using transmission electron microscopy methods and the quantitative parameters of structure, phase composition and dislocation substructure are established and comparison of these parameters for different quenching regimes is made. It is established that the differentiated hardening of rails by compressed air in different regimes is accompanied by the formation of morphologically different structure, being formed according to the diffusion mechanism of γ → α transformation and consisting of plate perlite grains, free ferrite grains and grains of ferritecarbide mixture. The being formed structure has the expressed gradient character: surface layer state of rail steel depends not only on the quenching regime but on the investigation direction and the depths of analyzed layer from the surface. The dislocation substructure in the form of chaos, nets, cells and fragments is revealed.
Source: Izvestiya Ferrous Metallurgy
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W2285521079