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Engineering MaterialsChoose the correct option: The BCC structure of Fe-C solid solution is known as (i) Ferrite (ii) Pearlite (iii) Cementite (iv) Austenite20242mEngineering MaterialsChoose the correct option: In the Fe-Fe_3C equilibrium diagram, ledeburite is: (i) A mixture of ferrite and austenite (ii) A single-phase austenitic structure (iii) Pure cementite (iv) A eutectic mixture of austenite and cementite20252mEngineering 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 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 sources20252m
PreviousChoose the correct option: According to Hume Rothery's rule, size of atoms must not differ by more than (i) 5% (ii) 35% (iii) 15% (iv) 55%NextChoose the correct option: Carbon and Nitrogen are introduced into the surface of steel during (i) Normalizing (ii) Cyaniding (iii) Hardening (iv) Tempering
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