The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Lubrication between wheel and rail in curves is generally known to decrease the friction between wheel and rail, resulting in the reduction of wear of wheel flange and rail gauge corner in high rail, corrugation growth in low rail and noise generation at both of high and low rails. However, the selection of kinds of lubricants and their application methods adopted by railway companies are not necessarily...
In high-speed railways, adhesion between wheel and rail is a very important function to maintain safety and stable operation from the standpoint of braking and driving, in particular under wet conditions at the wheel/rail interface. This paper describes an experimental investigation, which mainly focused on the effects of surface roughness and water temperature on the adhesion between wheel and rail...
Nickel-based self-fluxing alloys (SFA) have been widely used as coatings in the light of their high levels of wear and corrosion resistance. However, their resistance to wear can be substantially improved by reinforcement with tungsten carbide–cobalt hardmetals. In this work, a range of coatings based on a nickel-based self-fluxing alloy has been produced by laser cladding. The coatings have been...
This paper describes a numerical model to estimate the adhesion coefficient between rail and wheel under wet conditions, by applying the partial elasto-hydrodynamic lubrication (EHL) theory at three-dimensional (3D) contact considering surface roughness. The effect of the characteristics of surface roughness on the adhesion coefficient is particularly focused on in this study. Based upon numerical...
WC–Co coatings were deposited by HVOF spraying from two different feedstock powders, one with a conventionally sized WC grains and one with nanoscale WC grains. The powder feedstock with nanoscale WC grains was employed in the light of published research, which pointed to enhancements in wear resistance associated with nanoscale structures in WC–Co materials. The coatings were subsequently laser remelted...
The CrN and TiN coatings deposited on tool steel substrates by ion beam assisted deposition (IBAD) and triode ion-plating techniques, respectively, were investigated. The fretting wear of these coatings has been determined in air of different relative humidities (RHs). The results show that the coefficient of friction of the CrN coatings versus corundum at 50 and 85% RH is about 0.3, slightly higher...
This paper describes the behavior of adhesion coefficient, i.e. the maximum traction coefficient in the rolling direction between rail and wheel under a water lubricated condition for various values of rolling speed, slip ratio, contact load, surface roughness and water temperature by means of a simplified theory. The adhesion coefficient has been analyzed here by combining the elasto-hydrodynamic...
Dry sliding wear tests were performed on a Mg-9.0%, Al-0.9%, Zn (AZ91) alloy using a block on-ring (AISI 52100 steel) configuration. Wear rates were measured within a load range of 1-350N and a sliding velocity range of 0.1-2.0m/s Compositions, morphologies and microstructures of worn surfaces and wear debris were characterised by scanning electron microscope (SEM), energy dispersive X-ray spectrometer...
The dry sliding wear of an A356 aluminium alloy reinforced with nickel-coated non-graphitic carbon fibres (A356-4%C f ) was studied. Wear tests were carried out at constant load levels within the range of 5 to 300 N using a constant sliding velocity of 0.5 m s −1 . In addition, the effect of incremental loading on wear rates was also studied. Wear behaviour of A356-4%C f was...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.