Effects of Moulding Sand Permeability and Pouring Temperatures on Properties of Cast 6061 Aluminium Alloy

Abstract

Effects of moulding sand permeabilities prepared from the combinations of four proportions of coarse and fine particle size mixtures and pouring temperatures varied from 700, 750, and 800 (±10 ∘ C) were studied on the hardness, porosity, strength, and microstructure of cast aluminium pistons used in hydraulic brake master cylinder. Three sand moulds were prepared from each of the 80 : 20, 60 : 40, 40 : 60, and 20 : 80 ratios. The surfaces and microstructures of cast samples were examined using high resolution microscopic camera, metallurgical microscope with digital camera, and scanning electron microscope with EDX facilities. The best of the metallurgical properties were obtained from the combination of 80 : 20 coarse-fine sand ratio and 750 ± 10 ∘ C pouring temperature using as MgFeSi inoculant. An 8 : 25 ratio of coarse to fine grained eutectic aluminium alloy was obtained with enhanced metallographic properties. The cast alloy poured at 750 ± 1 ∘ C has a large number of fine grain formations assuming broom-resembling structures as shown in the 100 m size SEM image.

Wear and Corrosion of Wrought A6061 Aluminium Alloy in DOT3 Brake Fluid

“…A few reports are available on either wear or corrosion of cast A6061 alloy [8,15] but not on the as-received wrought A6061 aluminum alloy in less aggressive organic media such brake oil environments (pH range 10.0 to 11.5) or related hydraulic fluids for automobile and hydraulic pumps applications. The reason for this work is that it is part of a research project of which the following publications are already in public domain [8,[16][17][18][19][20][21]. The results showed certain degrees of aggressiveness of the brake fluid to cast AA6061 alloy which revealed some weakness in the production of quality brake fluid likely resulting from the adulteration.…”

Effect of Processing Parameters on the Protective Quality of Electroless Nickel-Phosphorus on Cast Aluminium Alloy

“…The metallurgical and surface properties that characterised the cast samples used in the present study have been discussed by the authors [41,42]. The present results also give further and better appreciation to the effective protective application of EN to solving or reducing the wear and corrosion of the cast aluminium alloy sample [43,44].…”

Determination of Thermophysical Properties for Selected Molding Sands

“…The mechanism of heat transfer through the sand mold is complex. It includes heat transfer through a single grain, heat transfer between neighboring grains, and intercrystalline exchange of heat by radiation and convection [3,4].…”

“…The greater the amount of molding sand, the more heat it can accumulate. The heat accumulation coefficient is mainly characterized by the mold's ability to store heat at a given time; the higher the value, the more the form accumulates heat at a given time [2][3][4][5].…”