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At what temperature is the workpiece tempered in carbonitriding process?

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At what temperature is the workpiece tempered in carbonitriding process?

(a) 180^oC

(b) 360^oC

(c) 540^oC

(d) 720^oC

I got this question during an internship interview.

This interesting question is from Nitriding, Cyaniding and Carbonitriding topic in section Heat Treatment of Engineering Material & Metallurgy

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The correct option is (a) 180^oC

Explanation: The carbonitriding process is carried out in a gas atmosphere furnace using a carburizing gas.The workpiece is heated to 850^oC in the mixture of gases for 2-10 hours. This is followed by quenching to increase hardness, then by tempering at 180^oC for reducing the brittleness.

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