Browsing by Author "Adekunle, A. S."
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Item Effect of using vegetable oils as quenching media for pure commercial aluminium(Proceedings of International Conference on Clean Technology & Engineering Management, 2012) Adekunle, A. S.; Odusote, J. K.; Rabiu, A. B.This paper presents the effects of rate of heat extraction by groundnut, melon, palm kernel, shea butter and palm oils on the mechanical properties of various samples of pure commercial aluminium heat treated at 200°C, 250°C, 300°C and 350°C. Muffle furnace equipped with digital thermometer and thermocouple was used for the heat treatment. Tensile strength and hardness tests were carried out using Instron Universal Tester and Vickers hardness methods, respectively. Results obtained from the experiment were presented graphically. The results showed that palm kernel oil cools faster at 200°C and 250°C, while palm oil and shea butter oil quench faster at 300°C and 350°C, respectively. Palm kernel oil offers the highest elongation at 200°C, while at 350°C shea butter oil gave the best result. The best among the bio-quenching oils in providing good ductility is shea butter oil at 200°C, while at 300°C and 350°C groundnut oil give the best result. Highest hardness values were obtained from samples quenched in melon oil between 200°C-300°C. However, these values decreased with increased heating temperature probably due to density and viscosity variation with temperature rise. Similar observations were made on most of other samples quenched in other bio-quenching oils used in this experiment. This study shows that these locally available vegetable oils have promising potentials to serve as a possible replacement for non-biodegradable mineral oils in many applicationsItem EFFECT OF VEGETABLE OIL QUENCHANTS ON THE PROPERTIES OF ALUMINUM DURING SOLUTION HEAT TREATMENT(Journal of Mechanical Engineering and Sciences (JMES), 2015) Odusote, J. K.; Adekunle, A. S.; Rabiu, A. B.Proper selection of appropriate quenching media can result in improved mechanical properties of pure commercial aluminum after solution heat treatment. This paper presents the effect of heat extraction by groundnut, melon, palm kernel, shea butter and palm oils on the mechanical properties of various samples of pure commercial aluminum heat treated at 200 °C, 250 °C, 300 °C and 350° C. A muffle furnace equipped with a digital thermometer and a thermocouple was used for the solution heat treatment. Tensile strength and hardness tests were carried out using an Instron Universal Tester and Vickers hardness methods, respectively. The results showed that palm kernel oil cools faster at 200 °C and 250 °C, while palm oil and shea butter oil quench faster at 300 °C and 350 °C, respectively. Solution heat treatment with palm kernel oil offered the highest percentage elongation at 200 °C, while at 350 °C shea butter oil gave the best percentage elongation. The best among the bio-quenching oils in providing good ductility is shea butter oil at 200 °C, while at 300 °C and 350 °C groundnut oil gives the best result. Highest hardness values were obtained from samples quenched in melon oil between 200 °C and 300 °C. However, these values decreased with increased heating temperature, probably due to the density and viscosity variation with temperature rise. Similar observations were made on other samples quenched in other bio-quenchant oils used in this experiment. This study shows that locally available vegetable oils have promising potential to serve as a possible replacement for nonbiodegradable mineral oils in many applications.Item Effectiveness of Biodegredable Oils as Quenching Media for Commercial Aluminum(2020) Adekunle, A. S.; Adeleke, A. A.; Ikubanni, P. P.; Adebiyi, K. A.; Adewuyi, O. A.The effectiveness of biodegradable oils such as palm oil, shea-butter oil and jatropha oil, compared to the conventional mineral oil, in the quenching of commercial aluminium was investigated. Pure commercial aluminium was solutionized in an electric furnace at (200, 250, 300 and 350) °C. The mechanical properties of the samples of commercial aluminium were determined while the cooling rate and quench severity of the oils were studied. The results showed that the quench severity of the oils is directly proportional to the heat-transfer coefficient; jatropha oil, palm oil, shea butter and conventional mineral oil had heat-transfer coefficients of (648.80, 621.38, 447.80 and 520.72) W/m2K at the nucleation region, while their quench severities were (0.861, 0.752, 0.630, and 0.758) m–1, respectively. The hardness values of the pure commercial aluminium after quenching in jatropha oil, shea-butter oil, palm oil and mineral oil were (116.7, 121.9, 116.0 and 91.1) HVN, with tensile strengths of (96.59, 127.60, 100.86 and 84.35) MPa, respectively. Shea-butter oil and palm oil are better quenching media for pure commercial aluminium when high ductility is required, while jatropha oil can be used when low ductility, or brittleness, is of importance.