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Structure and properties of rails after extremely long-term operation
https://doi.org/10.22349/1994-6716-2020-102-2-30-39
Abstract
The paper reveals regularities and mechanisms of structure-phase states and properties formation of of differentially hardened 100-m rails of DT 350 category after the passed tonnage of 1411 mln. tons brutto. The formation of highly defective surface layer with nanosize (40–50 nm) grain-subgrain structure of pearlite colonies and submicrocrystal (150–250 nm) structure grains with structure free ferrite is detected. The change of hardness, microhardness, crystal lattice parameter, microdistorsion level, scalar and excess dislocation density on the rails head section are analyzed. The possible mechanisms of cementite plates’ transformation at extremely long-term operation are discussed.
Supporting agencies: This work was financially supported by the Russian Foundation for Basic Research (RFBR), grant No 19-32-60001
About the Authors
Yu. F. Ivanov
Institute of High Current Electronics SB RAS
Russian Federation
Russian Federation
Dr Sc. (Phys-Math)
2/3 Akademichesky, 634055, Tomsk
V. E. Gromov
Siberian State Industrial University
Russian Federation
Russian Federation
Dr Sc. (Phys-Math)
42 Kirova St, 654007 Novokuznetsk
V. E. Kormyshev
Siberian State Industrial University
Russian Federation
Russian Federation
Cand. Sc. (Eng)
42 Kirova St, 654007 Novokuznetsk
A. M. Glezer
Institute of Metal Science and Physical Metallurgy, Central Research Institute of Ferrous Metallurgy named after I.P. Bardin
Russian Federation
Russian Federation
Dr Sc. (Phys-Math)
9/23 2nd Baumanskaya St, 105005, Moscow
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Review
For citations:
Ivanov Yu.F., Gromov V.E., Kormyshev V.E., Glezer A.M. Structure and properties of rails after extremely long-term operation. Voprosy Materialovedeniya. 2020;(2(102)):30-39. (In Russ.) https://doi.org/10.22349/1994-6716-2020-102-2-30-39
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