B. Determine key information from the plots (20 pts) 1. (10pts) Fe-C phase diagram, for Fe with 3wt%C melt at 1500C. Determine the equilibrium phases at each following temperature: At 1200C: At 1147C: At 1000C: At 727C: At 600C: w If Fe with 0.76wt% C melt slowly cooled from 1000C to 600C, the microstructure of the product is _, which is (uniform/core/lamellae) of ferrite and cementite phases; If Fe with 0.5wt% C melt slowly cooled from 1000C to 600C, the microstructure of the product is 530 Eur 700 2. (5pts) Based on the transformation diagram for Fe-C alloys, austenite with 0.76wt% carbon starting at 760C: 500 5001 If cooled rapidly to 600C, hold for 100s, then quenched to room temperature, the microstructure is 400 Temperature 300 Mt 200- MO MO If cooled rapidly to 350C, hold for 100s (dash line), then quenched to room temperature, the microstructure is If cooled rapidly to 600C, hold for 10s (dash line), quenched to room temperature, then reheated at 500C for tempering, the microstructure is 100 to 104 1 10 19-2 1 102 Times