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Engineering 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: Which of the following is the hardest? (i) Austenite (ii) Bainite (iii) Pearlite (iv) Martensite20242mEngineering MaterialsDescribe the three main types of metallic crystal structures (BCC, FCC, HCP) with their coordination numbers and packing factors.20257mEngineering MaterialsSketch the Fe-Fe_3C phase diagram and explain its key features.20257m