2. Knowing that the melting point of pure iron is 1538 C and there are three invariant reactions namely, at the peritectic (0.2% C, 1495 C), at the eutectic (4.3% C, 1148 C) and at the eutectoid (0.8% C, 727 C) points, sketch the iron - carbon phase diagram in the 0- 6.7% C interval. Label all the phase regions on it." Show the steel and the cast iron intervals on the same phase diagram. Decode the AISI-SAE 1040 steel. Choose carbon contents proper for an engine block and a car fender. Sketch the microstructure of the AISI-SAE 1040 steel at room temperature, and calculate the weight fractions of the total ferrite and the total cementite phases present in the microstructure.