The effect of vanadium alloying on the wear resistance of pearlitic rails

Authors
Solano-Alvarez, W 
Fernandez Gonzalez, L 
Bhadeshia, HKDH 

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Type
Article
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Abstract

Due to the increasing demand on pearlitic rails to support heavier loads and higher speeds, grooved rails for tramways and light rail transit (LRT) require strengthening via alloying or heat treatment, i.e. accelerated cooling after hot-rolling. In this study, the wear performance of five different commercial grades is compared using unlubricated twin-disc testing and detailed microstructural characterisation. Results indicate that the vanadium-alloyed steel experiences less than half the wear rate of a heat-treated grade with a similar hardness. This is attributed to the increased stability and toughness of vanadium-containing cementite, as compared to pure cementite. The evidence suggests that vanadium partitions into the cementite lamellae during the formation of pearlite. This improvement in wear resistance due to vanadium could enable an approximately two-fold reduction in the maintenance and life cycle costs relative to heat-treated rail alternatives.regarded as transition-phases relative to mixtures of cementite and ferrite.

Publication Date
2019
Online Publication Date
2019-08-12
Acceptance Date
2019-08-07
Keywords
Pearlite, Vanadium, Rail steel, Grooved rail, Wear resistance
Journal Title
Wear
Journal ISSN
0043-1648
1873-2577
Volume Title
436-437
Publisher
Elsevier BV
Sponsorship
Engineering and Physical Sciences Research Council (EP/M023060/1)
ArcelorMittal Research Collaboration Agreement number 6085701156.