Characterization of structure and properties of long differentially quenched rails after extremely long-term operation

2020 ◽  
Author(s):  
Yu. F. Ivanov ◽  
V. E. Kormyshev ◽  
V. E. Gromov ◽  
A. A. Yuriev ◽  
A. M. Glezer ◽  
...  
Keyword(s):  
Structure And Properties ◽  
Term Operation ◽  
Differentially Quenched Rails

scholarly journals Evolution of Structure and Properties of Differentially Quenched Rails During Long-Term Operation

2018 ◽  
Vol 39 (12) ◽  
pp. 1599-1646 ◽  
Author(s):  
V. E. Gromov ◽  
◽  
A. A. Yur’ev ◽  
Yu. F. Ivanov ◽  
S. V. Konovalov ◽  
...  
Keyword(s):  
Structure And Properties ◽  
Term Operation ◽  
Evolution Of Structure ◽  
Differentially Quenched Rails

Structure and properties of rails after extremely long-term operation

2020 ◽  
pp. 30-39 ◽  
Author(s):  
Yu. F. Ivanov ◽  
V. E. Gromov ◽  
V. E. Kormyshev ◽  
A. M. Glezer
Keyword(s):  
Surface Layer ◽  
Lattice Parameter ◽  
Crystal Lattice Parameter ◽  
Subgrain Structure ◽  
Structure And Properties ◽  
Term Operation ◽  
Head Section ◽  
Structure Phase ◽  
Defective Surface

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.

scholarly journals Structure and properties of differentially hardened 100-m rails after long-term operation

2020 ◽  
Vol 866 ◽  
pp. 012053
Author(s):  
V E Kormyshev ◽  
E V Polevoy ◽  
A V Golovatenko ◽  
V E Gromov ◽  
Yu F Ivanov ◽  
...  
Keyword(s):  
Structure And Properties ◽  
Term Operation

Contributions of Various Mechanisms to the Hardening of Differentially Quenched Rails during Long-Term Operation

2018 ◽  
Vol 2018 (10) ◽  
pp. 985-989 ◽  
Author(s):  
Yu. F. Ivanov ◽  
V. E. Gromov ◽  
A. A. Yur’ev ◽  
A. M. Glezer ◽  
N. A. Popova ◽  
...  
Keyword(s):  
Term Operation ◽  
Differentially Quenched Rails

Serviceability Characterization of Composite Storage Tanks

2007 ◽  
Author(s):  
Vladimir M. Shkolnikov
Keyword(s):  
Structural Design ◽  
Design Procedure ◽  
Fatigue Properties ◽  
Storage Tanks ◽  
Safety Factors ◽  
Analytical Technique ◽  
Term Operation ◽  
Temperature Exposure

This paper outlines an analytical technique enabling serviceability characterization of a storage tank made of a Polymer Matrix Composite (PMC) with regards to a specified profile of long-term operation of the tank. The technique combines force-temperature exposure (conceivably changing over a tank’s service life) and fatigue properties of a composite utilized within the tank structure. Along with a serviceability assessment, the technique is capable of providing a well-grounded specification of design knock-downs and safety factors relevant to the conventional structural design procedure.

Long-term operation of rail steel: Degradation of structure and properties of surface layer

2016 ◽  
Vol 10 (5) ◽  
pp. 1101-1105 ◽  
Author(s):  
V. E. Gromov ◽  
Yu. F. Ivanov ◽  
K. V. Morozov ◽  
O. A. Peregudov ◽  
O. A. Semina
Keyword(s):  
Surface Layer ◽  
Rail Steel ◽  
Structure And Properties ◽  
Term Operation ◽  
Degradation Of Structure

scholarly journals Electrochemical and physical characterization of Ni-Cu-Fe alloy for chlor-alkali hydrogen cathodes

2003 ◽  
Vol 28 (2) ◽  
pp. 21-28 ◽  
Author(s):  
M. J. Giz ◽  
M. C. Marengo ◽  
E. A. Ticianelli ◽  
E. R. Gonzalez
Keyword(s):  
Low Ph ◽  
Physical Characterization ◽  
Energy Dispersive Analysis ◽  
Positive Aspect ◽  
X Ray ◽  
Term Operation ◽  
Different Temperatures ◽  
X Ray Absorption

This work describes the development of an alternative acetate bath for the electrochemical codeposition of Ni-Cu-Fe electrodes at low pH that is stable for several weeks and produces electrodes with good performance for chlor-alkali electrolysis. Physical characterization of the electrode surface was made using X ray absorption spectroscopy (XAS), scanning electron microscopy (SEM) and energy dispersive analysis (EDX). The evaluation of the material as electrocatalyst for the hydrogen evolution reaction (her) was carried out in brine solution (160 g L-1 NaCl + 150 g L-1 NaOH) at different temperatures through steady-state polarization curves. The Ni-Cu-Fe electrodes obtained with this bath have shown low overpotentials for the her, around 0.150 V at 353 K, and good stability under continuous long-term operation for 260 hours. One positive aspect of this cathode is that the polarization behavior of the material shows only one Tafel slope over the temperature range of 298 - 353 K.

Structure-phase states and properties of rail tread surface at long-term operation

2021 ◽  
Vol 64 (1) ◽  
pp. 71-77
Author(s):  
Yu.F. Ivanov ◽  
◽  
V.E. Kormyshev ◽  
V.E. Gromov ◽  
A.A. Yuriev ◽  
...  
Keyword(s):  
Material Science ◽  
Lattice Parameter ◽  
Crystal Lattice Parameter ◽  
Subgrain Structure ◽  
Term Operation ◽  
Structure Phase ◽  
Multiple Transformation ◽  
Lamellar Pearlite ◽  
Differentially Quenched Rails

Using the methods of modern physical material science the investigations of structure-phase states and properties at different depth from tread surface of differentially quenched rails at extremely long-term operation (passed tonnage 1411 mln t) are carried out. The hardness decrease from 37.1 to 35.8 HRC at the depth 2 and 10 mm and microhardness from 1481 to 1210 MPa, respectively is revealed. The established multiple transformation of tread surface structure concludes in: fracture of lamellar pearlite structure and subgrain structure formation of submicronsizes (100-150 nm); precipitation of carbide phase nanoparticles (30-55 nm)along the boundaries and in the volume ofsubgrains; growth of microdistorsions and α-Fe crystal lattice parameter; growth of scalar and excess dislocation density. The suggestions about the possible reasons of observable regularities are made.

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