THE INFLUENCE OF CONTACT PRESSURE, SLIDING VELOCITY AND HARDNESS ON DRY WEAR OF STEELS FOR TYRES OF RAIL WHEELS
Journal Title: Tribologia - Year 2009, Vol 226, Issue 4
Abstract
In this article, wear test results of three carbon steels (B6, C54 and C55) are presented. These tests have been performed on a modified Timken wear-testing machine in dry sliding conditions. To obtain an initial point contact (like in wheel – rail system), two cylinders with perpendicular axes have been used as elements of the tested pair. One of them had a motionless specimen, and the second one had a counter-specimen rotated around its axis. Volume loss and apparent contact area vs. load, sliding speed, and sliding distance were determined. On the basis of these results, the linear wear rate and contact pressure were calculated. Results of these calculations have been utilised to determine the influence of pressure, sliding speed, and material hardness on the wear rate of the tested steels. These influences have been mathematically described with an exponential function, which was used to analyse the wear behaviour of the researched materials. Optical microscopic observations of worn surfaces were carried out to study wear mechanisms.<br/><br/>
Authors and Affiliations
Mirosław Witaszek, Kazimierz Witaszek
Keywords
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