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Engineering MaterialsExplain the following: Case Hardening20243.5mEngineering 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 MaterialsWrite a short note on: Super alloy20257mEngineering MaterialsChoose the correct option: Carbon and Nitrogen are introduced into the surface of steel during (i) Normalizing (ii) Cyaniding (iii) Hardening (iv) Tempering20242m