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The plain fatigue and fretting fatigue behaviour of a plasma nitrided dual phase stainless steel known as 3CR12 and an AISI 316 austentic stainless steel have been studied in the present work, using a modified Wohler rotating-bending configuration. Test specimens were produced at two nitriding temperatures, namely 400 and 520 o C, representing low temperature and conventional nitriding temperature,...
The wear performance of ultrafine-grained tungsten carbide–cobalt (WC–Co) hard metals during three-body abrasion and particle erosion has been evaluated and compared to that of similar conventional coarser grained hard metals. The tungsten carbide grain size varied between 0.5 and 3μm with cobalt contents ranging from 6 to 15%. Silica particles were used in both forms of testing. Erosion was carried...
The slurry erosion performance of ultrafine WC-Co composites sintered from powder produced through the spray conversion process has been evaluated and compared to that of conventional materials. Slurry erosion testing has been carried out using the jet impingement method and slurry composed of water and 500 μm diameter silica sand. The erosion resistance of WC-Co hard metals is seen to increase dramatically...
A study has been made of the critical variables of particle type and size, flux and velocity on the erosion of a 1Cr Mo boiler tube steel up to temperatures of 600°C in a purpose-built air-blast laboratory rig. Whilst particle type has a slight effect on wastage, particle size, flux and velocity affect the magnitude of the erosion rate significantly.
A study has been made of the sliding wear behaviour of ultrahigh molecular weight polyethylene (UHMWPE) against a smooth counterface of partially stabilized zirconia (PSZ) in distilled water and in saline solution containing small additions of synovial fluid and up to 15% of albumen.The results have shown that the addition of proteins to the lubricating medium leads to a lowering of wear rates and...
One of the major areas of wear in the generation of power from coal occurs in the pneumatic transport of the pulverised fuel from the coal mills to the burners. This erosion of the pipes is vastly accelerated at the pipe bends, therefore the choice of lining material is extremely important.This paper addresses the problem through the systematic erosion testing, at different angles of impact, of fifteen...
Wear of boiler tubes in pulverised fuel power stations by erosion is a serious problem that often leads to unscheduled and costly outages. Hence there is a need for a hot erosive wear testing facility that simulates boiler conditions and allows accelerated wear testing of materials to be undertaken. This paper reports on the development of an apparatus that is intended to simulate the conditions in...
A series of cemented tungsten carbides with different binder phases consisting of combinations of cobalt, nickel and chromium have been subjected to erosion-corrosion testing using a silica-water slurry. The polarization characteristics of these cermets have also been investigated using a potentiodynamic technique. It was found that the cermets exhibit decreasing slurry erosion rates with an increase...
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