R260 Rayının Mantar, Gövde ve Taban Kısımlarının Tribolojik Özelliklerinin Araştırılması

Abstract

It is important to know tribological properties of rail and wheel for predicting the service life of both components. In railway, the tribological system is open and the harsh working condition can be seen as the contact stress between rail and wheel is extremely high. The behaviour of the tribological system varies depending on the chosen rail-wheel materials and also third body (water, humidity, lubricant, debris and combination of these elements). The coefficient of friction and wear resistance are strongly dominated by chosen material and its properties. Up to now, a number of researchers focused only on the tribological properties of the head of rail material. Recent experimental study has devoted to investigate the tribological properties of head, web and foot sections of R260 rail, as the mechanical properties of rail changes from the head to the foot of rail. Different sections of R260 rail have been evaluated in terms of microstructural, hardness, tribological and wear resistance properties. According to obtained results of the ball-on-disc wear tests, the highest wear resistance belongs the head of R260 rail as expected. The coefficients of friction of the web, head and foot of R260 have been found as 0.39, 0.35 and 0.38, respectively.