Railroad rails made of bainitic steel |
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Authors: | V V Pavlov L A Godik L V Korneva N A Kozyrev E P Kuznetsov |
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Affiliation: | (1) Novokuznetsk Metallurgical Combine, Russia |
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Abstract: | Results are presented from a study of the mechanical characteristics and microstructure of rails made at the Novokuznetsk
Metallurgical Combine from steel alloyed with manganese, silicon, chromium, molybdenum, and vanadium. It was established that
obtaining high strength and hardness in the steel by increasing its contents of carbon and alloying elements has an adverse
effect on the service properties of rails made of steels with a bainitic structure. Normalizing is the most effective means
of increasing strength and improving microstructure. The required level of mechanical characteristics can be obtained by tempering
the steel at 350–370°C. The adverse effect of cold straightening-which is manifest in a reduction in the rails’s impact toughness-can
be offset by subjecting the steel to preliminary tempering or normalizing and tempering. Rather than further increasing the
strength of rail steel to improve its overall quality, this objective is better served by making sure that the steel is cleanly
made, that the rails have little or no curvature, and that the residual stresses in the steel are favorably distributed.
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Translated from Metallurg, No. 4, pp. 51–53, April, 2007. |
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