Fe3C 600 4000 0.761 2 3 44.30 5 6 6.7 (Fe) 120 μm Co, wt% CResult: Pearlite = Fe3C (cementite-hard)alternating layers ofα and Fe3C phases α (ferrite-soft) 6 Summary• Phase diagrams are useful tools to determine: --the number and types of phases, --the wt% of each phase, --and the composition of each phase for a given T and composition of the system.• Alloying to produce a solid solution usually --increases the tensile strength (TS) --decreases the ductility.• Binary eutectics and binary eutectoids allow for a range of microstructures. 13 7
