13. What is the quenching media used in heat treatment to obtain faster rate of cooling?
Brine solution
Air
Oil
Water
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Water is one of the most efficient quenching media where maximum hardness is desired, but there is a small chance that it may cause distortion and tiny cracking. When hardness can be sacrificed, mineral oils are often used. ... The cooling rate of oil is much less than water.
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Water
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