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Problem 1. In the following fig. 1. you find the phase diagram for Fe-C. Fig. 1. Fe-C phase diagram. 1.1. Explain why a phase diagram and an equilibrium diagram is identically. 1.2. Show the liquidus and the solidusline in the diagram. 1.3. Find and name all three phase reactions in the diagram. 1.4. Show the phases you will go through with cooling a system with 1,5% weight %carbon from 1500oC to 500oC. 1.5. Use the lever rule to calculate how much you have of each phase at the following temperature 1500oC 1400oC 1200oC 1000oC 800oC 500oC. 1.6. Show what phases there will be in each “room” in the phase diagram. 1.7. Explain why the austenitic structure will give higher flexibility than the ferritic structure. 1.8. Explain why the strength of the steel will increase with increasing carbon content. Problem 2. You have the equilibrium diagram for Sn-Pb. 2.1. Explain why there are difference between weight % (wt%) and atomic % (at %). 2.2. Give some reasons for no mixability between the phases α and β. 2.3. Mark the soludisline and the liquidusline in the diagram. 2.4. Mark all three phase reactions. 2.5. Explain what happens and which structures you will find with cooling a mixture with 61.9 wt% Sn and the rest Pb from 300oC to room temperature. 2.6. Use the lever rule to calculate the amount of each phase with the same composition as above at 300oC 200oC 184oC 182oC 100oC -------------------------

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