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Why is atmospheric nitrogen inappropriate for use in the nitriding process?

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in Engineering Material & Metallurgy by (773k points)
Why is atmospheric nitrogen inappropriate for use in the nitriding process?

(a) Cannot be heated

(b) Insufficient density

(c) Inability to be absorbed

(d) Expensive process

I got this question in my homework.

My doubt stems from Nitriding, Cyaniding and Carbonitriding topic in division Heat Treatment of Engineering Material & Metallurgy

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Right answer is (c) Inability to be absorbed

The best explanation: Ordinary atmospheric nitrogen exists in the form of molecules (N2). As a result, these molecules cannot be absorbed by the steel, which is necessary for the nitriding process. Therefore, atmospheric nitrogen is not suitable for nitriding process.

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