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A series of cavitation erosion tests were carried out to investigate the resistance of the TiN coatings against cavitation action. The TiN coatings were deposited at various deposition parameters on austenitic stainless steel, X6CrNiTi18-10, with various coating thicknesses by means of the cathodic arc evaporation method (CAVD). Investigations were performed in a cavitation tunnel with a slot cavitator...
The ‘dynarat’ computer model is used to simulate accumulation of plastic shear strain (ratcheting) in rails and to predict wear and crack initiation. Recent developments have focussed on models of microstructure and strain hardening characteristics, based on twin-disc tests with British normal grade (Grade 220) rail steel. In Europe, and increasingly in Britain, the harder Grade 260 rail steel is...
Bronze-impregnated carbon matrix composites with different mass percentages of Al 2 O 3 particulate reinforcement were prepared through compression molding, carbonization and impregnation. Effect of Al 2 O 3 particle content on the electrical performance, tribological and mechanical properties of composites was studied. The results showed that the electrical resistivity...
In today's oil/gas industry, use of drill bits in harsh drilling conditions is demanding the pursuit of innovated materials for higher performance and efficiency. This paper describes the successful application of indium doping in tungsten carbide particle reinforced Cu-alloy composites (Cu-alloy/WC p ) for PDC (polycrystalline diamond compact) drill bit body in maximizing wear resistance...
This study addresses the roughening of AISI 316 LVM and Ti6Al4V by waterjet peening (WJP) without abrasive particles, looking for rough surfaces free of embedded particles that could act as severe notches. Strong parameters have been selected to characterize and check viability of abrasiveless WJP; a water pressure of 360MPa and two slow traverse velocities: 0.05 and 0.1m/min. After processing, large...
The effect of the microstructure on the dry sliding wear of six aluminium alloy 6061 matrix composites reinforced with 15vol.% of MoSi 2 particles and two monolithic 6061 alloys processed by powder metallurgy with and without ball milling has been studied. Wear testing was undertaken using pin-on-ring configuration against an M2 steel counterface at 0.94m/s and normal load of 42, 91 and 140N...
The SiC f /SiC ceramic matrix composites find applications in structural, wear resistance and high temperature applications as they are quite superior to their monolithic counter parts due to their improved flaw tolerance, large work of fracture and non-catastrophic failure behaviour. In this investigation, three types of SiC f /SiC composites, i.e., SiC f /SiC composite with...
Micro-abrasive wear test, also called ball cratering test, is normally used to investigate the wear behavior of hard bulk materials or wear-resistant coatings. In this work, this test was used to investigate the wear behavior of metallic samples. The results showed that the embedment of abrasive particles and the formation of grooves in the crater's surface may induce to artificially small wear coefficient...
A comparative study has been carried out on dry sliding wear behavior of in situ Al–4.5Cu–5TiB 2 composite subjected to single or multiple mushy state roll passes, each to 5% thickness reduction at 626°C (temperature for 20% liquid). The results of wear tests using a pin-on-disc machine under normal loads of 20 or 40N have been analyzed to determine wear rate, friction and wear coefficients...
In this work, an investigation has been carried out to study the effects of the choice of substrate material on the tribological performance of TiB 2 –TiC–Al 2 O 3 composite coating developed by laser cladding. The coatings have been deposited employing different laser scan speeds on AISI 1020 mild steel and AISI 304 stainless steel substrates using pre-placed precursor powder...
Fe–Cr–Ni metastable austenitic stainless steel is widely used in industry because of its excellent performance of corrosion resistance in aggressive environment. The process of drawing austenitic stainless steel easily prompts to wear and the relevant friction behavior, under the condition of friction coupling plastic deformation, is seldom studied. This paper studies the friction behavior of SUS...
A sprocket is a toothed wheel, commonly used in drive systems, to which the strength and wear resistance of the teeth are important. Sprockets are conventionally fashioned by hobbing, followed by heat treatment. However, the fine-blanking process has recently seen increasing use by sprocket manufacturers. The process of fine-blanking has the possibility of reducing the number of process operations,...
The wear behaviour of a variety of alumina–copper interpenetrating composites was tested as a function of copper ligament diameter and volume fraction of copper. The wear mechanisms of pure copper and pure alumina were adhesive and abrasive wear, respectively. In the composites with 1μm, 5μm and 15μm copper ligament diameters, the wear mechanism was a mixture of adhesive and oxidative; in composites...
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