Choose the correct option: Identify the correct statement regarding ca

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Module 4: Heat Treatment of Steel

20252m

Choose the correct option:

Identify the correct statement regarding case hardening/surface hardening processes:

(i) Harden only high-carbon steels by through hardening
(ii) Modify the surface composition by diffusion of carbon and/or nitrogen while keeping a tougher core
(iii) Rely only in rapid quenching with no change in composition
(iv) Use only flame or induction as heat sources

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