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Fuel rods in a pressurized water nuclear reactor (PWR) experience coolant flow-induced relative motion against the grid support features, a phenomenon called grid-to-rod fretting (GTRF), which may cause progressive fretting wear damage. Wear-through of the cladding on fuel rods will leak the radioactive fuel into the coolant loop to significantly increase the radiation level in PWR primary loop and...
The objectives of this work were to determine the influence of frictional heating on the wear of Fe30Ni20Mn25Al25, a recently developed nanostructured spinodal alloy with high strength and hardness, and to investigate the role played by third bodies (oxide wear debris and tribolayers) on the wear process. Pins of the subject alloy were tested in dry sliding against disks made from AISI 347 stainless...
In the cores of pressurized water nuclear reactors, water-flow induced vibration is known to cause claddings on the fuel rods to rub against their supporting grids. Such grid-to-rod-fretting (GTRF) may lead to fretting wear-through and the leakage of radioactive species. The surfaces of actual zirconium alloy claddings in a reactor are inevitably oxidized in the high-temperature pressurized water,...
Novel biobased nanocomposites have been prepared by the cationic copolymerization of conjugated low saturated soybean oil with styrene and divinylbenzene, and a reactive organomodified montmorillonite (VMMT) clay as reinforcing phase. Microscale tribological measurements were performed on samples with different concentration of VMMT (0%, 1% and 5%, w/w) using a ball-on-flat reciprocating microtribometer...
Dry sliding tests were performed on as-cast magnesium alloys Mg 97 Zn 1 Y 2 and AZ91 using a pin-on-disc configuration. Coefficients of friction and wear rates were measured within a load range of 20–380 and 20–240N at a sliding velocity of 0.785m/s. X-ray differactometer, scanning electron microscopy, tensile testing machine were used to characterize the microstructures and...
In the present work, Al–Pb alloy was irradiated by high current pulsed electron beam. X-ray diffractometer, electronic probe microanalysis, scanning electron microscopy and Knoop hardness indentation were used to characterize the microstructure and mechanical property of Al–Pb alloy. The results show that the microstructure and mechanical property can be greatly improved. The tribological properties...
A new aluminum bronze material with aluminum content over the solubility limit and several trace elements, Cu–14Al–X alloy (X is trace elements), has been developed for drawing dies. The mechanical properties such as hardness, tensile strength and impact toughness were evaluated experimentally. The friction and wear behavior of the material was investigated under boundary lubrication conditions. The...
The wear behavior of hot extruded Al–Si–Pb alloys was investigated under dry conditions in a temperature range 25–200°C using a pin-on-disc type wear testing machine. The results show that the microstructure and mechanical properties can be greatly improved and porosity can be significantly decreased by hot extrusion. These factors contribute to great increase in wear resistance of hot extruded Al–Si–Pb...
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