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Which of the following is not a diffusion method of surface heat treatment?

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in Engineering Material & Metallurgy by (773k points)
Which of the following is not a diffusion method of surface heat treatment?

(a) Carburizing

(b) Cyaniding

(c) Induction hardening

(d) Carbonitriding

The question was asked in a job interview.

The origin of the question is Carburizing topic in section Heat Treatment of Engineering Material & Metallurgy

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Correct answer is (c) Induction hardening

The best explanation: The treatment of steels to achieve a hard casing and softer core is known as surface heat treatment or surface hardening. The diffusion methods of surface heat treatment are classified as carburizing, cyaniding, nitriding, and carbonitriding. Thermal methods include flame hardening and induction hardening.

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