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Cemented carbides match properties required for many wear related applications through the control of microstructure such as Co binder content, WC grain size, type and content of additives, etc. However, their hardness is usually raised at the expense of fracture toughness. The effect of hard erodent particle impact energy on the wear of cemented carbides containing differently sized grains (fine,...
Many engineering tests start with a run-in procedure, as it is commonly accepted that running-in at some fraction of the target load is beneficial due to a reduction in surface roughness. However, the choice of load and duration is often based on historical context or the experience and philosophies of the testing personnel. The objectives of this study were to (1) evaluate the effects of contact...
The present work studied the dynamic sliding friction of pencil lead samples on inclined dry and oiled smooth glass plates. Four types of samples with different masses and lead hardnesses (4B and 4H) but identical diameters were used to vary the contact surface conditions. The results showed that the sliding velocity for a given angle increased as the mass of the sample increased; the velocity also...
To investigate the wear mechanism and microstructural evolution of Ti6Al4V titanium alloy under the condition of dual rotary fretting (DRF), which mainly exists in the interfaces of ball-and-socket joints with the motion combing torsional fretting with rotational fretting. Using the Ti6Al4V titanium alloy flat specimen against the 52100 steel ball to investigate the DRF and damage behavior were carried...
Research on tungsten carbides, used for drag bits inserts in tunnel boring machine, has been going on through decades for the improvement of mechanical and wear properties. The microstructure, the toughness, the hardness as well as the design of inserts are the main parameters in their functionalities and lifetime. This study emphasizes the behavior of tungsten carbide inserts in impact-sliding conditions...
Protic ammonium carboxylate tri-[bis(2-hydroxyethylammonium)] citrate (DCi) ionic liquid has been used as neat lubricant of the stainless steel-sapphire pair. In order to improve its tribological performance, few-layers graphene nanoplatelets (G) or 4wt.% nanodiamonds aqueous suspension (ND) have been dispersed (in a nanophase proportion of 0.1wt.%) in DCi. Both carbon nanophases reduce the friction...
The performance of coatings for tribological applications is strongly associated with substrate properties and the presence of lubricants between the contacting faces. In this study, plasma nitriding followed by the application of a hydrogenated Diamond-like Carbon (DLC) film (a-C:H) was coated onto grey cast iron (GCI) substrates using a single thermal cycle. Four distinct reciprocating cylinder-plane...
The effect of WC on cold spray deposition and erosive wear performance of Ni-WC composite coatings was studied. WC and Ni powders were fed to the gun from separate hoppers and a blend of Ni-36 vol% WC was sprayed onto mild steel substrates. By using three different WC powder sizes, the effect of WC size on coating build-up and WC retention were tested. Using smaller size WC particle, higher retention...
Electronic connectors are extensively used in the car industry. However, due to engine vibration, fretting wear damage can decay the electrical contact resistance. In addition to small fretting oscillations, the connectors are subjected to clipping/unclipping, which also affects the Electrical Contact Resistance (ECR) endurance (i.e., Nc fretting cycles when ΔR>ΔRc=4mΩ). To investigate this complex...
Honing is an industrial alternative of internal grinding for finishing large-diameter bores of internal combustion engine cylinders. This paper introduces a hybrid approach for a multi-scale analysis of surface finish in abrasive honing. The methodology is based on morphological identification of scratch pattern of manufactured surfaces, produced at various honing conditions, and their 2D continuous...
Beyond the sense of sight, the sense of touch is one of the primary ways that individuals experience their surrounding environment. Fundamentally understanding the relationship of skin-surface tribology and its elicited tactile attributes could provide a breakthrough in improving the ability to efficiently transmit tactile information to those who rely on the sense of touch to interact with their...
Computational fluid dynamics (CFD) is a useful tool to predict the erosion behaviour over geometries exposed to conditions of severe erosion wear. This work shows how CFD can be used to virtually characterize the wear behaviour of materials used in several hydraulic components, including turbomachinery systems, in which it is important to consider the effect of particle size. In addition, this work...
Skin in biological systems, including humans, perform several synchronized tasks (mechanical, protective, tactile, sensory, etc.). Tribological function is among skin tasks and may determine the survivability of many species. Cross comparison of tribological functional traits of skin of different species, albeit interesting, is rarely encountered, if at all exists, in tribology literature. One interesting...
Microstructure evolution in polycrystalline metals, which undergo sliding contact, takes place by dislocation activity, followed by dislocation pile-up, formation of low-angle grain boundaries and consolidation of those low-angle grain boundaries as nanocrystalline grains, thus resulting in grain refinement. In dry contacts or boundary lubrication, this plasticity dominated process occurs in competition...
Aluminum alloy 6063 (AA6063) composite with varying proportion of snail-shell-ash (SSA) and silicon carbide (SiC) reinforcement has been developed by stir-casting. Hardness and erosion-corrosion characteristics of the composite were studied. Erosion-corrosion behaviour of the composite was studied in a mono-ethylene glycol (MEG)-water environment with 20% v/v of ethylene glycol and 0.1g/L silica sand...
A nitrided case composed of expanded martensite and small quantities of hexagonal ε-Fe24N10 iron nitrides was formed in a martensitic stainless steel by means of active screen plasma nitriding process. Nanoindentation tests were carried out in order to assess the mechanical properties and to obtain an energy dissipation coefficient defined as the ratio of plastic to total deformation energy. Friction...
The response of tungsten carbide hardmetals with differing binder chemistries and carbide grain sizes to a traversing diamond indenter under load has been investigated in two principal regimes; single pass traverses and a multi-pass regime intended to simulate two-body abrasion experienced when the hardmetal is worn by a hard, high crushing strength abradant. The two-body regime is intended to simulate...
In-situ Raman spectroscopy was performed on 1010 steel coatings thermally sprayed on an Al-Si alloy on A 380 (Al-9.0% Si) cylinder bore and subjected to reciprocating sliding against various coated rings to investigate the progression of iron oxide formation during sliding. The coatings evaluated for the top compression ring (TCR) included diamond-like carbon (DLC) and chromium nitride (CrN). The...
Friction and wear behaviors of in-situ Cf/Al2O3, Cf/Al2O3, and Al2O3 were examined under dry sliding, water, PAO oil and PAO+carbon nanotube (CNT) grease at applied load of 6.86N by ball-on-disk sliding tribotester. Both in-situ Cf/Al2O3 and Cf/Al2O3 were fabricated by hot-press sintering in vacuum. In-situ Cf/Al2O3 used cheap and flexible pre-oxidized polyacrylonitrile fibers to in-situ transform...
The corrosion-erosion behaviour and mechanisms of in-situ transformed carbon fiber reinforced alumina ceramic matrix composite (Cf/Al2O3), homemade alumina (H-Al2O3) and commercial alumina (C-Al2O3) were investigated by a modified MSH tester. The both in-situ Cf/Al2O3 and H-Al2O3 were fabricated by hot-press sintering in vacuum. The corrosion-erosion experiments for the three kinds of specimens were...
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