Effect of heat treatment on hardness and wear properties of an aluminum alloy of motorcycle piston (original) (raw)
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International Journal of Engineering, 2019
Piston aluminum alloys have different intermetallic phases, such as Cu3Al, Mg2Si ,and AlNi phases. The morphology and the distribution of such phases have important roles on mechanical properties of the piston material. Therefore, in this research, various ageing heat treatments on the mentioned material were done and the microstructural feature and the hardness were studied. Obtained results showed that solutioning at 515 °C for 7 hours and ageing at 205 °C for 7 hours, was the superior heat treatment process, since such treatment led to increase the hardness value to its highest value (153 BHN) for the piston aluminum alloy. This heat treatment caused to increase the size of Si particles obviously and caused to precipitate other intermetallic phases of Al (Ni,Cu) and Ni-Si. Additionally, solutioning at 500 °C for 5 hours and ageing at 180 °C for 9 hours resulted in coarsening Si and Al-Ni participates in the longitudinal direction, which was caused to increase the hardness value to 137 BHN. Energy dispersive X-ray spectroscopy (EDS) results indicated that when the specimen aged at 230 °C for 5 hours, other intermetallic phases such as Al (Ni,Si) and Mg2Si appeared in the matrix.
Effect of Age Hardening on Wear Properties of Aluminum Alloys Piston
2009
This paper reported on the effect of age hardening on the wear properties of aluminum alloy piston. These studies were carried out to improve the wear properties of the aluminum alloys piston by using age hardening method. AlSiCuMg alloys with 8%Si were used for this purpose. The solution treatment was performed at 500 ⁰ C for 5 h and then quenched. The samples have been aged at 130 ⁰ C, 170 ⁰ C and 210 ⁰ C among 1h-6h to observe the effect of the aging condition of hardness properties. Vickers microhardness tests were performed to determine the hardness of the samples. Microstructure analysis of the samples was carried out using optical microscope equipped with a digital camera and Scanning Electron Microscope (SEM). The results showed that the aging time of 2h at 170 ⁰ C improves the wear properties of the aluminum alloy pistons. Wear Rate, (mm 3 /m) Sliding Distance, (km) As Received Solution Treatment Aging-130⁰C/5h Aging-170⁰C/2h Aging
2019
This research work is aimed at improving the wear resistance and mechanical properties of a cast motorcycle piston from recycled aluminium pistons. Locally sourced recycled aluminium piston was used as the matrix whereas a charcoal ash content of constant percentage was used as the reinforcement material. The compositions of the recycled piston scrap and charcoal ash were acquired. The matrix material was kept at its slurry state under heat and preheated volume fractions of 0% and 10% charcoal ash particles were added by stir casting. The molten mixture was then poured into a mould having prepared piston sand core in place to obtain a piston. Careful examination was done on the piston after fettling and cleaning, where the piston was found to be good. The cast piston was machined to standard piston size and dimension. The microstructural and mechanical properties of the composites were studied. The result indicated that there was increase in the melting temperature, solidification t...
Optimum heat treatment of aluminum alloy used in manufacturing of automotive piston components
Materials and Manufacturing Processes, 2018
Many automotive components that were earlier made of cast iron are now using aluminum alloys due to their lower weight, better castability, corrosion resistance, and strength at elevated temperatures. Heat treatment is a major processing step in the manufacturing of aluminumbased piston components. The current paper discusses an optimum heat treatment strategy for AC8H aluminum alloy for improved performance. Solutionizing (for homogenization) is followed by aging at different temperatures. Tensile, impact, and hardness tests are performed on untreated and heat treated specimens. Structural analysis (microscopy) is done to understand the changes in mechanical properties. Fractography is also carried out to identify fracture mechanisms under gradual and impact loads. Yield strength, ultimate strength, hardness, and impact toughness show significant increase when aged at 150°C and 175°C (maximum values of 80 MPa, 177 MPa, 28 HRA, and 5.25 J respectively) but decrease at 200°C. SEM micrographs of fracture surfaces show ductile, brittle, and mixed-mode failure patterns for different samples. Observed structural changes are in line with changes in the mechanical properties. It can be concluded that optimum combination of properties is obtained when specimens are aged at 175°C. These findings are of direct utility for academicians, researchers, and practitioners involved in design and manufacture of automobile and other engineering components.
Study on wear properties of aluminium–silicon piston alloy
Low expansion aluminium-silicon eutectic alloys are cast to produce most of the automotive pistons. The structure and properties of these alloys are very much dependent on the cooling rate, composition, modification and heat treatment operations. In this study, locally available automotive 'scrap pistons' were used as basic raw materials and a natural gas fired crucible furnace was used for melting purpose. The wear behaviour of both as-cast and heat treated specimens were studied under dry sliding conditions at room temperature using a pinon-disc type wear testing apparatus. The extent of wear damage and the type of wear were investigated by means of weight loss measurement and optical microscopy techniques. The full heat treatment showed a great influence on the wear properties of the aluminiumsilicon piston alloy as it reduced the wear rate of the specimens. The exceptional high tensile strength and hardness were attributed to the heat treatment condition with decrease in ductility. Significant changes in structure were also observed to occur specially in the primary and eutectic silicon phases. Some of the results of this study can be recommended for tribological use of this alloy in manufacturing automobile spare parts. # 2001 Published by Elsevier Science B.V.
2017
The study deals with the evaluation of wear property of eutectic, hypereutectic and super eutectic aluminium alloy under various heat treated conditions. Pistons are produced from cast or forged, high-temperature resistant aluminium silicon alloys. There are three basic types of aluminium piston alloys. The standard piston alloy is a eutectic Al-12%Si alloy containing in addition approx. 1% each of Cu, Ni and Mg. Special eutectic alloys are also evaluated for improved strength at high temperatures. Hypereutectic alloys with 18 and 24% Si provide lower thermal expansion and wear, but have lower strength. The wear analysis is carried out under the various conditions like speed, time and loading conditions and for all the conditions of eutectic, hypereutectic and special eutectic aluminium alloys. The experimentation is carried on a pin on disc type wear testing machine by varying the speed of the disc, various loads applied and various timing conditions. The properties are evaluated f...
Effect of microstructure on wear behaviour of aluminium 2014 (Al2014)
IOP Conference Series: Materials Science and Engineering, 2020
The paper investigates the effect of ageing on the hardness and wearing of Al2014. Precipitation hardening and ageing were carried out on the samples. The samples were solution treated at 550°C and were naturally aged. Quenching was carried out using ice-brine solution. Vickers Hardness were taken at regular intervals till 900 hours. The peak hardness value of the natural aged sample was found to be 86HV (93 hours) as compared to the untreated sample (32.4HV) The wear tests were conducted at 10N, 500rpm for 30 minutes. After the tribo test it was observed that the coefficient of friction increased by 7.06% in the naturally aged sample, but the wear rate in case of as-received samples was 46% higher than that of the naturally aged sample. The change in the microstructure of Al2014 is the primary reason for the difference in wear rate of the samples. The present work will help to understand the influence of heat treatment of aluminium alloy on wear properties.
2009
Semisolid AlSiMg casting alloys are attractive alternatives for automotive and aeronautical applications. In this work the effects of heat treatments on hardness and tribological properties of A356 aluminium alloy obtained by Sub-Liquidus Casting (SLC) were studied. The optimum heat treatment conditions, in which the material presents the maximum hardening and wear resistance values, were determined. Heat treatment conditions investigated included: A356 SLC as cast, T5 and T6. Furthermore, AC-46500 and A6061/T6 were analyzed for comparison. The tribological properties of the samples were investigated by pin-on-disc tests at 5 N and 0.05 and 0.1 m·s -1 in dry conditions. The samples were studied by SEM-EDX techniques in order to determine the wear mechanisms and the determination of the products produced during the tests. The maximum hardness and the lowest dry wear rate were obtained through T6 thermal treatment condition.
Mechanical Properties and Wear Strengths of Piston Alloy-Alumina Composites
Aluminium metal matrix composites reinforced with alumina particles have better mechanical and tribological properties than aluminium alloys. For this reasons these composites are widely used in aerospace and automobile industries. In this work Scrap piston alloy was used as master alloy because it contains silicon and magnesium. Silicon increases the casting ability and magnesium increases the wettability of alumina particles in master alloy. The desired composites were produced by the stir casting method by adding 5%, 10% and 15% alumina particles in master alloy respectively. For each of the composite alumina particles were preheated to a temperature of 800°C for 2 hours. Then particles were added gradually into the molten master alloy for achieving improved wettability and uniform distribution. The stirring was continued for 5 minutes. Finally composites ware poured into permanent metallic moulds at a temperature of 650°C. The hardness and tensile strength of the composites were examined. All composites have higher strength than master alloy. Addition of alumina particles in master alloy increases the hardness of the composites. The wear tests were conducted using pin on disc wear testing machine with counter surface as steel disc of hardness HRC 32 and surface roughness of 0.62 µm. The composite pin was used as specimens and all the wear tests were carried out in air and dry sliding conditions. It was found that composites have superior wear resistance property over master alloy. It was also examined the effect of load, sliding speed and sliding distance on wear behaviour. All these three factors increase the wear loss. Microstructural characterization of the composites has performed.
A DISSERTATION ON WEAR BEHAVIOUR OF ALUMINIUM & BRASS
Abstract: Wear is major problem in industry and its direct cost is estimated to vary between 1 to 4 % of gross national product. Therefore many efforts have been made to produce more durable materials and techniques to reduce the wear of the tools and the engineering components. These include modification of bulk properties of the materials, surface treatments and application of the coating, etc. over the last few years many efforts have been made to understand the behavior of the surfaces in sliding contact and the mechanism, which leads to wear. The applications of the Aluminum, Mild steel composites for the machine parts, particularly due to some very attractive characteristics such as high strength to weight ratio, excellent cast ability, pressure tightness, low coefficient of thermal expansion, good thermal conductivity, good mechanical properties and corrosion resistance The composites are mainly used in aerospace, automobiles, marine engineering and turbine compressor engineering applications. MMCs are used for light weight as well as high temperature applications. MMCs found wide applications in marine castings, motor cars & lorry fittings/pistons & engine parts, cylinder block and heads, cylinder liners, axles & wheels, rocker arms , automotive transmission casings, water cooled manifolds and jackets , piston for internal combustion engines , pump parts, high speed rotating parts and impellers etc.