Wear Test Research Papers - Academia.edu (original) (raw)

In this paper the usability of two casting methods, of sand and high pressure cast for the anodization of AlSi12 and AlSi9Cu3
aluminium cast alloys was investigated. With defined anodization parameters like electrolyte composition and temperature, current type and value a anodic alumina surface layer was produced. The quality, size and properties of the anodic layer was investigated after the anodization of the chosen aluminium cast alloys. The Alumina layer was observed used light microscope, also the mechanical properties were measured as well the abrasive wear test was made with using ABR-8251 equipment. The researches included analyze of the influence of chemical composition, geometry and roughness of anodic layer obtained on aluminum casts. Conducted investigations shows the areas of later researches, especially in the direction of the possible, next optimization anodization process of aluminum casting alloys, for
example in the range of raising resistance on corrosion to achieve a suitable anodic surface layer on elements for increasing applications in the aggressive environment for example as materials on working building constructions, elements in electronics and construction parts in air and automotive industry.

- by and +1
- •
- Anodization, Mechanical Properties of Materials, Surface treatment, Aluminium Cast Alloys

Metal matrix composites (MMCs) have a potential for enhanced wear conflict in excess of the unreinforced aluminum alloy and are the most capable in achieving enhanced mechanical properties. In the present investigation, composites of Aluminum 6061(Al6061) matrix material is reinforced with micron size Silicon carbide (µSiC) reinforcement with 5, 10 and 15 weight percentages (wt.%) and nano size SiC (nSiC) with 0.5, 1.0 and 1.5 wt.% are fabricated by stir casting technique. The stir casted composites are further heat treated and the specimens are prepared as per ASTM standards to conduct hardness and wear tests. The fabricated and heat treated nano composites showed enhancement in hardness and wear resistance more than the micro composites. The microstructure of the worn out specimen are examined by scanning electron microscope. Taking into contemplation all the factors, it can be concluded that aluminum based composite with 1.0% by weight nano SiC reinforcement acquire superior wear resistance properties as compared to micro SiC reinforced aluminum metal matrix composites.

- by IAEME Publication
- •
- Hardness, Wear Test, Stir Casting, Aluminum Metal Matrix Composites

In railway systems, certain atmospheric conditions-mainly related to temperature and relative humidity-lead to the creation of iron oxides which can affect the coefficient of friction between the wheel and the rail. This can result in increased wear of the rail, reducing its service life and thus increasing replacement costs. Pin-on-disc tests were conducted in a climate chamber to study the influence of environmental conditions and iron oxides on the coefficient of friction. The iron oxides generated on the surface of specimens extracted from microalloyed rail steel during wear tests were analysed using X-ray diffraction. The results show that hematite (α-Fe 2 O 3) is the predominant iron oxide among all the oxides generated on the worn surfaces. It was further noted that the oxide layer resulting from the rise in both temperature and relative humidity does not significantly affect the average coefficient of friction for each steel samples tested. High relative humidity combined with high temperature leads to the formation of α-Fe 2 O 3 , which tends to increase the coefficient of friction. However, a boundary lubrication effect is observed at higher relative humidity due to a condensed water film, which reduces the coefficient of friction and counteracts the increase of the coefficient of friction expected due to the presence of hematite.

In this paper, Al-based composites reinforced by Alumina and Al-Ni intermetallic compounds have been successfully fabricated by mechanical alloying technique. The intermetallic phase, i.e., NiAl, NiAl 3 , Ni 2 Al 3 , as well as Alumina, were formed in the aluminum matrix by in situ solid-state reactions between pure Al and NiO powders. The effects of NiO content (7-10-13 vol%) on the characteristics of the fabricated composites were examined, the hardness, wear properties, phase constituent, and composite microstructure with different NiO content in particular. The results showed that the addition of NiO to Al increases the formation of Al-Ni system intermetallic compounds and enhance the surface hardness. Further, it is ascertained that Al-10 vol% NiO nanocomposite has better wear properties in comparison with samples with 7 and 13 vol% NiO due to the better matrix integrity and reinforcement distribution in the Al matrix.

- by ehsan borhani
- •
- Mechanical Engineering, Materials Science, Mechanical Alloying, Wear Test
- by Maksim Antonov and +1
- •
- Engineering, Environmental Engineering, Mechanical Engineering, Chemical Engineering

In railway systems, certain atmospheric conditions – mainly related to temperature and relative humidity – lead to the creation of iron oxides which can affect the coefficient of friction between the wheel and the rail. This can result in increased wear of the rail, reducing its service life and thus increasing replacement costs. Pin-on-disc tests were conducted in a climate chamber to study the influence of environmental conditions and iron oxides on the coefficient of friction. The iron oxides generated on the surface of specimens extracted from microalloyed rail steel during wear tests were analysed using X-ray diffraction. The results show that hematite (α-Fe2O3) is the predominant iron oxide among all the oxides generated on the worn surfaces. It was further noted that the oxide layer resulting from the rise in both temperature and relative humidity does not significantly affect the average coefficient of friction for each steel samples tested. High relative humidity combined w...

— This study investigates the wear resistance of four thermomechanical treated monolithic AA6061 alloy, using a pin-on-disc test. In addition to the widely studied AA6061 alloy in T6 condition, the present investigation considered a low temperature thermomechanical treatment which included solution treatment, cold rolling of specimens at various deformation percentages (percentage reduction) and artificial ageing. Experiments were designed using Taguchi's method and were conducted on a pin-on-disc test setup. Four factors and four level combination using L 16 orthogonal arrays was applied. Signal-to-noise (S/N) ratio with smaller the better quality characteristics was considered for the obtained results by carrying out Analysis of Variance (ANOVA) to study the tribological behaviour of thermomechanical treated AA6061. Results indicate that the factor percentage reduction had the highest significance while the factor sliding distance had the least significance on the wear rate. Optimum combination for reduced wear rate was found to be with level 4 of percentage reduction, level 4 of load, level 3 of sliding speed and level 2 of sliding distance.

- by Ramakrishna Vikas S and +1
- •
- Cold Rolling, Wear Test, AA6061 Alloy, Low Temperature Thermomechanical Treatment
- by sia m
- •
- Engineering, Environmental Engineering, Mechanical Engineering, Chemical Engineering