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Which stage of quenching is the slowest?

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in Engineering Material & Metallurgy by (773k points)
Which stage of quenching is the slowest?

(a) Vapour-Jacket

(b) Vapour-Transport cooling

(c) Liquid-Cooling

(d) They are all equally slow

The question was posed to me in a national level competition.

Enquiry is from Normalising & Quenching topic in portion Heat Treatment of Engineering Material & Metallurgy

1 Answer

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Best answer
Correct answer is (c) Liquid-Cooling

The best I can explain: In general, both vapor-jacket and liquid-cooling are slow cooking stages. However, liquid-cooling is the slowest as all the heat transfer occurs through conduction across the solid-liquid interface.

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