Abstract
Abstract—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.
Original language | English |
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Pages (from-to) | 710-715 |
Number of pages | 6 |
Journal | Russian Metallurgy (Metally) |
Volume | 2019 |
Issue number | 7 |
DOIs | |
Publication status | Published - 1 Jul 2019 |
Keywords
- Keywords: differentially quenched rails
- long-term operation
- phase composition
- structure
ASJC Scopus subject areas
- Metals and Alloys