Abstract
In this paper, the effect of the cooling medium on the strength of torsion and hardness is discussed. The specimen used in this study is of medium carbon steel grade. The carbon percentage was determined as 0.55% C through the Arl spectroscopy instrument. The specimen dimension is 6 mm in diameter, gauge length is 76 mm and the total length is 144 mm. Different cooling mediums such as water, air, furnace atmosphere and oil were used to determine the effect of cooling speed on mechanical properties, specifically the torsion strength and hardness. In all treatments, the holding period was 30 minutes. From the results, cooling in the furnace atmosphere had the greatest impact on the resistance of the torsion of the carbon steel from other cooling methods. The non-heat-treated sample was the least resistant between the samples whereas the water-cooled sample had the highest in terms of their scratch resistance according to the results of the hardness device.
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