4. The figure below shows the phase diagram for a hypereutectoid plain carbon steel. Assume that point c is slightly above 723 °C and point d is slightly below 723 °C. i. Explain the structure at points a, b, c, and d on the diagram. Determine the wt% of proeutectoid cementite at point c. iii. Determine the wt% of eutectoid cementite at point d. ii. Temperature (°C) 1100 900 700 500 300 100 0 100% Fe 0.02 1.0 Fe,C 1.2 2.0 Fe, C Fe, C Pearlite 3.0 4.0 Weight percent carbon y + Fe, C 723°C a + Fe, C 5.0 Fe,C 6.0 6.7

For a 70-30 Zn-Cu alloy, what would the percent of each phase be at 800°C and 500°C?

1-The microstructural design of Iron-Carbon(Fe-C) alloys has led to the development of vast range of  steels for structural material applications. The phase diagram provide means for producing specific microstructures. Using the phase diagram below to  answer the following questions A – If the liquid mixture of Fe-3%Wt C is slowly cooled from 1600 C to 1200C indicate the phase(S) that are present at 1200 C . Also calculate the composition of the of phases.(10)           B-Describe the sequence of all  phase transformation that accour from Fe-1.5%wt C is slowly cooled from 1600 C to 400 C. Use the diagram below to to describe the microstructures for each phase transformation (10)

When alloys A, B, and C are gently cooled from 1000 o C in the following temperature ranges, sketch their microstructures. (equilibrium cooling). List every phase present in the microstructures. Comment on the constituent phases of the resulting alloy and its mechanical characteristics. Please keep it brief.