A complex decrease in wear of wheel flanges and side surfaces of rails is of high technical and economic importance for railroad engineering. The type and quality of construction materials used for constructing railway wheels and rails are substantial factors determining the wear resistance of the goods. Russian rails are made of hardened carbon steels type M76, M76V, M76T, M76C and M76VT (hardness 341 HB to 388 HB) or of hot-rolled steels type M74, M74T, M74C (hardness 255 HB to 302 HB, manganese, vanadium, titanium and/or zirconium-doped). The bands of locomotove wheels are made of alloyed steels type 1 or 2 (hardness 248 HB and 255 HB, respectively). The elliptical wheel-rail contact surface (1.5 cm2 to 2 cm2) is loaded vertically (115 kN to 120 kN in average). The shearing stress at the contact surface can reach even 2300 MPa and the compressive stress 500 MPa at a high travelling speed of the train. The shearing stress is considerably higher than the plastic range of the steel. The quality of the rails and wheel bands was controlled with a newly constructed device K-61 by measurement of coercive force and with a new structuroscope T-71 by measurements of magnetic permeability (connected with structural state of carbon steels) and hardness. The T-71 device was recommended for practical use in the railway shops.
Evaluation of construction materials used for wheel bands and rails
Titel russisch
Tjazeloe Masinostroenie ; 11 ; 16-20
2000
5 Seiten, 2 Bilder, 2 Tabellen
Aufsatz (Zeitschrift)
Russisch
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