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The influence of welded layers composition on the abrasive wear mechanism of friction couples “hard layer-steel” is analyzed. Strength, surface morphology, chemical and structural composition, abrasive wear resistance of welded layers are investigated. When cutting low carbon and chromium content layers with abrasive particles, the wear predominates there as it does under plastic deformation, while...
A wear test with abrasion was conducted for Hinoki cypress, Spruce and Agathis wood, and yield stress parameters on stress–strain diagrams were also extracted by mechanical tests. The relationship between the wear action and the mechanical parameters was investigated on the basis of the following extracted parameters of the yield stress, σ ylim , σ y3% , σ y0.2% , and σ ...
Diamond and diamond-based coatings have long been studied for their exceptional properties. Although a great deal of research has been carried out in this field, little is known about their tribological wear behavior. In the present work, diamond reinforced composite (DRC) coatings of varying diamond content was deposited on mild steel substrates using both oxy-acetylene (OA) and high velocity oxy...
In this study, AISI 8620 steel was boronized using the solid state boronizing technique. Processes were carried out at the temperatures of 850, 900 and 950°C for 2, 4 and 6h of treatment. Abrasive wear behavior of the samples boronized at different temperatures and treatment durations have been examined. Using boronized and unboronized samples, abrasive tests were conducted using pin on disc test...
In this study four irons were casted with different chromium and vanadium contents: 2.66% Cr, 5.01% Cr, 2.51% V and 5.19% V. Their microstructure is composed of: ledeburite, graphite and M 3 C carbides (cementite). Pin-abrasion tests were carried out using fixed alumina abrasive grains at different loads: 1, 2, 4.6 and 10N. The wear surface and the abrasive paper were examined by scanning...
Oil and water repellent sol–gel silica coatings may be used to extend the use and lifetime of certain computer displays, optoelectronic devices, and optical components such as touch screens. Organic–inorganic coatings consisting of organically modified silica are an optimal class of materials to use for such applications as they are substantially more durable than conventional polymers while having...
Wear of materials is a widely recognised industrial problem. The direct costs of wear failures, such as wear part replacements, loss of productivity as well as indirect losses of energy, and the increased environmental burden, are real problems in everyday work and business. The mineral industry is particularly susceptible to wear part consumption resulting in high expenses.In this study, the performance...
Abrasive wear is of particular significance in ground engaging applications and increasingly tools are being modified with wear resistant hard facings to extend operational lifetimes. There is a continuous demand for improved performance but without significant increases in production or tool costs. When assessing a new material's performance full scale field trials are both expensive and difficult...
The effect of boron on the abrasive wear behavior of the austenitic Fe–Cr–C–Si–B hardfacing alloys was investigated with varying boron concentration. It was found that the abrasive wear resistance of the hardfacing alloys increased up to 50% compared to that of boron-free alloys with increasing boron concentration. The mechanism of the abrasive wear resistance changed at 0.6wt.% boron. Below 0.6wt...
Abrasive wear is responsible for intensive degradation of machine parts or tools. This process starts as an interaction between hard, mostly mineral, particles and the working surface. Methods of increasing the lifetime are based on application of abrasion resistant materials or creation of hard, wear-resistant surface layers or coatings on the surfaces of machine parts or tools. Carbon and low-alloy...
The abrasive wear resistance of white cast iron was studied. The iron was solidified using two solidification rates of 1.5 and 15°C/s. Mass loss was evaluated with tests of the type pin on abrasive disc using alumina of different sizes. Two matrices were tested: one predominantly austenitic and the other predominantly martensitic, containing M 3 C carbides. Samples with cooling rate of 15°C/s...
Abrasive wear is currently classified according to different particle dynamics: (a) the sliding of active particles on the sample surface and (b) the rolling of abrasive particles between the surfaces. In this paper, instrumented laboratory tests are used to present a new methodology for the simulation of abrasive wear. The rolling of the abrasives is represented by a sequence of indentations, and...
Effects of particle abrasive sizes on wear resistance of mottled cast iron with different retained austenite contents were studied. Abrasive wear tests using a pin test on alumina paper were carried out, using abrasive sizes between 16μm and 192μm. Retained austenite content of the matrix was determined by X-ray diffraction. The wear surface of samples and the alumina paper were examined by scanning...
Direct metal laser sintering (DMLS) is one of the popular rapid prototyping technologies for producing metal prototypes and tooling of complex geometry in a short time. However, processing of metal matrix composites (MMCs) by laser sintering is still in infant stage. Thermal cracks and de-bonding of reinforcements are reported while processing MMCs by laser sintering process. There are reports on...
The fundamental aim of the present research is to study the effect of dimple shape and area density on abrasive wear in lubricated sliding. The other aims are to recommend a method of obtaining the local linear wear of a textured ring on the basis of profilometric measurement and to analyse the changes in the surface topography of this ring with selection of parameters that could monitor the “zero-wear”...
Abrasive wear behavior of ductile irons with different dual matrix structures has been investigated. In order to obtain ductile irons with different dual matrix structures an unalloyed ductile iron specimens were austenitized in the two-phase region (α+γ) at various temperature (795°C and 815°C) and then rapidly transferred to a salt bath held at the 365°C for austempering for 30, 90 and 120min. Some...
The abrasive wear behaviors of aluminum alloyed Hadfield steel at the high and low stress wear conditions were studied and compared with non-Al alloyed Hadfield steel. The wear tests were done with the pin on disc method using the abrasive wheel. The main parameters such as alloy compositions, normal load, sliding speed and sliding distance were evaluated. It is shown that at the low stress condition,...
The abrasive wear behaviour of many materials is closely related to their hardness. However, classical wear models do not take into consideration the contact scale dependence of hardness, an effect commonly known as indentation size effect (ISE). In this work is carried out an evaluation of the abrasive wear behaviour of ductile metallic materials at the nanometric contact scale, by performing AFM-based...
New dispersions of the ionic liquid (IL) 1-octyl-3-methylimidazolium tetrafluoroborate ([OMIM]BF 4 ) and ZnO nanoparticles in epoxy resin (RE) have been prepared and characterized by SEM and TEM, and their thermal and dynamic mechanical properties have been determined. The presence of ZnO nanoparticles increases the stiffness of the epoxy resin, while the addition of the IL phase enhances...
This paper analyses friction coefficient evolution of dry lubricant coatings subjected to unidirectional sliding. Dry lubricant coatings have been investigated for maintaining low friction under sliding conditions, and have been used for this purpose in mechanical components. Experimental characterisation of coating durability can be achieved by measuring the friction coefficient as a function of...
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