Formation of Gradient Structure–Phase States in the Surface Layers of 100-m Differentially Quenched Rails

—The evolution of the structural-phase states in the surface layers of the head of differentially quenched DT350 rails to a depth of 10 mm are studied by optical microscopy and transmission electron diffraction microscopy along the central axis after the passage of a tonnage of 691.8 mln t gross in...

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Published inRussian metallurgy Metally Vol. 2019; no. 7; pp. 710 - 715
Main Authors Gromov, V. E., Yur’ev, A. A., Ivanov, Yu. F., Morozov, K. V., Konovalov, S. V., Peregudov, O. A.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.07.2019
Springer Nature B.V
Subjects
Cementite
Chemistry and Materials Science
Curvature
Dislocation density
Materials Science
Metallic Materials
Microscopes
Microscopy
Optical microscopy
Pearlite
Quenching
Rail transportation
Rails
Surface layers
Tonnage
Transmission electron diffraction
phase composition
long-term operation
differentially quenched rails
structure
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Summary:—The evolution of the structural-phase states in the surface layers of the head of differentially quenched DT350 rails to a depth of 10 mm are studied by optical microscopy and transmission electron diffraction microscopy along the central axis after the passage of a tonnage of 691.8 mln t gross in the experimental ring of AO VNIIZhT (proof ground for railway transport). The formation of a gradient structure is revealed. In this structure, the scalar and excess dislocation densities, the lattice curvature–torsion amplitude, and the degree of deformation-induced transformation of lamellar pearlite change gradually. The mechanisms of fracture of cementite lamellae are considered.
ISSN:0036-0295
1555-6255
1531-8648
DOI:10.1134/S003602951907005X