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An investigation was conducted on the possible beneficial synergistic effects of multiple additives in self-lubricating composites for use in high temperature friction and wear applications. The sliding friction and wear rates of NiAl based self-lubricating composites with different solid lubricant additions (PbO, Ti 3 SiC 2 –MoS 2 , Ti 3 SiC 2 –WS 2 ...
Passive materials like 304L stainless steel (SS), Zirconium-702, Zircaloy-4 and Titanium-grade2 exhibit an active–passive behavior in an aqueous environment. Corrosion and wear interactions are of great importance since the growth of a passive film provides protection against corrosion, while wear may destroy the protective passive film. Wear tests were carried out on a linear reciprocatory and pin...
TiB/TiC-reinforced titanium matrix composite coatings were prepared by laser cladding on Ti6Al4V substrates. The effects of the addition of Y 2 O 3 on the microstructure, microhardness, fracture toughness, and dry sliding wear resistance of the coatings were investigated. Microstructural observation showed that the coatings mainly consisted of TiC and TiB particles uniformly dispersed...
Ultrafine-grained pure Al and Al-based composites with 10 and 20vol% of Al 2 O 3 were produced by cold consolidation of powders using high-pressure torsion (HPT). Ball-on-disc wear resistance of Al was improved by HPT when compared to its coarse-grained counterpart processed with H24 treatment (cold rolling followed by low-temperature annealing). Wear width decreased but wear depth...
This study aims to elucidate the synergy effects of the σ phase and carbide on the wear behavior of low-carbon (LC) and high-carbon (HC) cobalt–chromium–molybdenum (CoCrMo) alloys, by using pin-on-disc tests under Hanks' lubricated conditions. Fractured or torn-off σ-phase precipitates were observed to be the main reason for abrasion for both LC and HC alloys. Carbides were torn off at the initial...
This paper presents an experimental test to analyze friction phenomena within the tool–chip interface in metal cutting. Therefore, it is designed to obtain experimental data under conditions that are characterized by high contact temperatures, pressures and sliding velocities. The experimental approach is derived from an orthogonal cutting process, modified to a high speed forming and friction process...
Investigations in graphene of controlling friction and wear of Ni 3 Al matrix self-lubricating composites (NMSC) are needed for moving mechanical assemblies. The friction and wear behaviors of NMSC with graphene nanoplatelets (GNPs) against Si 3 N 4 ball are tested using a constant load of 10N and a constant speed of 0.2m/s from room temperature (RT) to 600°C. Tribological...
Polypropylene/viscose fiber (PP/VF) composite with a surface pattern consisting of periodic, micro-scale cylindrical pillars were manufactured and the effect of fiber loading and micro-patterning on the friction and wear properties of the composites was studied. The micro-patterned viscose fiber composite surfaces were prepared via melt compounding and injection molding. SEM studies showed that the...
Hypervelocity gouging occurs in high speed sliding systems such as rocket sled test tracks, light gas guns, and electromagnetic railguns. Gouging takes the form of teardrop-shaped craters on the rail surface, and occurs above a threshold speed which is dependent on the slider and rail materials. In this study, gouging of aluminum railgun armatures on flat and indented copper rails was performed to...
The damage mechanism of cavitation erosion was investigated for austenite (γ)→martensite (α') phase transformable Fe–Cr–C–Mn/Ni alloys. In the case of phase transformable alloy, α' was formed evenly within the grains. It was assumed that the α' phase transformation absorbed the collapse energies of cavities and obstructed the propagation of cracks from grain boundaries into the grain. Consequently,...
Curve squeal is the result of the lateral force in rolling contact of rail and wheels along curves. Recently, field measurements of wheel squeal occurrences at a site in Australia showed an increasing possibility for a squeal event to occur as the relative humidity increases. To verify these results, a new method to measure the lateral and normal force simultaneously was developed on a test rig, so...
The development of composite friction materials, such as organically bound brake pads, is to a great extent done on the basis of experience. Material developers have very few software tools available, which support the development process with simulations and help to reduce the number of prototypes and tests.The focus of this work is on the temperature field in organic friction materials, which is...
The cost of erosion attack to the global oil and gas industry has drawn significant attention amongst researchers in recent years. Erosion is a complex phenomenon and in order to recommend ways to mitigate its effect it is essential to have a full understanding of the tribo-mechanisms involved. In the present study erosion tests were conducted on API X42 steel using aluminum oxide as erodent. The...
The objective of this study is to investigate the effect of laser cladding coating on wear and damage behaviors of heavy-haul wheel/rail materials by means of a laboratory-scale rolling–sliding wear apparatus. The results indicate that the wheel/rail rollers with laser cladding form a uniform and compacted coating without any cracks or stomata. The laser cladding coating markedly improves wear-resistance...
This article presents the theoretical modeling and computation of liquid impingement erosion of solid metallic surface and the response mechanisms, with special interest in study of the liquid impingement erosion behavior of NiAl alloy. Particular attention is paid to investigating the effects of drop velocity and drop size on the damage of the target surface and to predicting and simulating the erosive...
A numerical simulation of the wear sustained by the surface of an FZG pinion during a gear micropitting test was performed. Underlying the simulation is a mixed lubrication model that takes into account both surface roughness and lubricant properties, as well as a wear model based on Archard's wear equation. The adequacy of the models was ascertained by comparing simulated and measured roughness profiles...
The wear resistance of Ni–P alloys can be improved by the addition of W; however, it is not well understood how that addition will affect the corrosion–wear characteristics of the alloy. Therefore, a Ni–W–P alloy was prepared by electrodeposition and used for tribo-testing. The corrosion–wear behavior of the alloy, both in the as-prepared and heat-treated states, was investigated using a submerged...
The use of microscale deterministic surface features has been investigated in many bearing and seal applications in recent research. This paper considers a class of surface textures that are comprised of periodic arrays of deterministic geometric shapes created using photolithography-based manufacturing processes. These features are unique in that they can be modeled as biplanar: the topography of...
Tool wear is a very important factor determining tool life and surface quality of a machined workpiece surface. In the range of small cutting geometries the cutting depth can be in the range of the cutting edge radius, hence, it promotes the development of built-up edges (BUE). A systematic and comprehensive examination of built-up edge formation and associated microstructural features is still lacking...
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