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Engineering MaterialsChoose 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 sources20252mEngineering MaterialsDefine annealing, normalising, tempering and spheroidising of steel, stating the typical heating temperature range relative to critical temperatures, holding, and cooling conditions.20257mEngineering MaterialsName the important heat treatment processes of steel. Explain any two of them with neat sketches.20246mEngineering MaterialsChoose the correct option: The main purpose of normalising a hypoeutectoid steel is to: (i) Produce very soft coarse pearlite for maximum ductility only (ii) Refine grain size and produce uniform fine pearlite for improved strength and toughness (iii) Form martensite for maximum hardness (iv) Produce spheroidised cementite for easy machining20252m