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Engineering MaterialsChoose the correct option: Carbon and Nitrogen are introduced into the surface of steel during (i) Normalizing (ii) Cyaniding (iii) Hardening (iv) Tempering20242mEngineering 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 machining20252mEngineering MaterialsExplain the purpose of alloying in steels, naming at least four common alloying elements and summarising their main effects on mechanical properties.20257m
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