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Effectiveness of Blended Biodegradable Oils as Quenchants

Shankar M Havalad, P. Dinesh, S. B. Patil

Abstract


In the present work, improvements of mechanical properties of aluminum 6061 quenched in biodegradable oils were studied. In the heat treatment process, the specimens were heated to solution to a temperature of 530ºC and held at that temperature for some time and quenched to cool down; the quenching media being blends of neem oil, safflower oil and soybean oil. Specimens were then heated to a temperature of 175˚C for ageing. The specimens were then subjected to wear test, hardness test and impact test to evaluate improvements in the mechanical properties. The same heat treatment was repeated by adding 5% of quench accelerators (2.5% potassium nitrate and 2.5% magnesium nitrate by weight) to the quenching media. The test results of these specimens were compared with the results of the quenching media without quench accelerators. The results obtained are as follows: among the three oil blends safflower oil + soybean oil without quench accelerator showed the highest hardness compared to the untreated specimens and other oil blends. The oil blend, neem oil + safflower oil without quench accelerator, showed the improvement in the wear resistance of the specimens compared to the other oil blends and untreated specimens. The specimens which were quenched in the oil blends such as neem oil + soybean oil with and without quench accelerator and safflower oil + soybean oil without quench accelerator showed the decrease in the impact energy of the specimens compared to the untreated specimens and other oil blends.

Keywords


Biodegradable oil; Metal salts; Heat treatment

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References


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DOI: https://doi.org/10.37628/jpnc.v4i2.771

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