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How is cooling of the material done is normalising process?

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How is cooling of the material done is normalising process?

(a) Furnace

(b) Cooling tower

(c) Still air

(d) Liquid chamber

This question was addressed to me in an interview for internship.

The above asked question is from Normalising & Quenching in chapter Heat Treatment of Engineering Material & Metallurgy

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The correct answer is (c) Still air

To elaborate: Normalising is a process similar to annealing, which helps to refine grain structure, increase strength, and relieve stresses and other properties. Cooling for annealing is done in a furnace, whereas it is done in still air for normalising.

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