As pure iron is heated up through 910°C will it: 1600 C 1400 C liquid 910 C Y + cementite Fe,C cementite 723 C a + cementite 0% weight % carbon 7% Contract Expand O Maintain constant volume melt

7. Consider 1.5 kg of a 99.6 wt% Fe-0.4 wt% C steel that is cooled to a temperature just below the eutectoid. (a) How many kilograms of ferrite (a) form? (b) How many kilograms of cementite (Fe;C) form? Include your tie line in the solution. 1600| L 1400 T(°C) 1200 (austenite) y+L 1148°C L+Fe;C 1000 Y + Fe;C 800 727°C 600 a + Fe;C 400 1 2 4 6 6.7 C, wt% C Fe;C (cementite)

At what temperature does the first liquid phase form at 90% Ni? T(°C) 1600 1500 1400 1300 1200 1100 1000, L (liquid) L+α solidus liquidus 80 100 20 40 60 80 wt% Ni

Use the Cu-Ag Phase Diagram below to answer the following questions Composition (at% Ag) 20 40 60 80 100 2200 1200 A 2000 Liquidus 1000 Liquid 1800 Solidus C F a +L 1600 * 800 779 C (T) B+L E G 91.2 (Ceg 8.0 71.9 1400 (Cg). 1200 600 Solvus 1000 a +B 800 400 600 200 o 400 100 20 40 60 80 (Cu) Composition (wt% Ag) (Ag) Temperature ("C) Temperature ("F)

1. four processes. 2. Fill out the blanks by labeling the phase regions. 3. Identify the Indicate an in- termediate compound, if any. 3. Temperature (°C) 1600 1400 1200 1000 800 600 400 1538°C 0 (Fe) -1493°C 1394°C 912°C y, Austenite 1 2 0.16 5 0,022 a, Ferrite A N 2.14 Composition (at% C) 15 10 3 1147°C L4 3 4 Composition (wt% C) 4.30 727°C Sketch the microstructure at A, label phases, figure out compositions. 20 Cementite (Fe3C). 5 6 25 6.70

1. What are the point A and point B meaning? Please explain in detail and write the reaction equation. T(° C) 1600 1400 L y+L 1200 1148° C [+Fe;C |(austenite) 1000 y+Fe;C 800 727° C = Eutectoid a+Fe,C 400 3 0.76 4 4.30 6. 6.7 C, wt% C (Fe) ina 2. What are Hypoeutectoid and Hypoeutectoid? Please explain in detail Fe,C (cementite)

Use the Lead-Tin (Pb-Sn) phase diagram below to answer the following questions: Place the following microstructures in the correct order of formation for slowly cooling a 98 wt% Sn alloy from 300 °C to room temperature (point A to point B).

QI/ Draw a thermal equilibrium diagram for the binary alloy system (Si –Au), from the following data:- a- Si melts at 1414 °C, and Au melts at 1064 °C , and identify all phases are present in the diagram. b- Eutectic is formed at 360°C containing 20 Wt% Si -80 Wt% Au . c- Determine the amount of each phase for the alloy which consist 60 Wt% Si- 40Wt % Au at 1200 °C and 800 °C ,then determine the amount of eutectic at 200 °C?

What are the reactions at O and B?

An AISI 4340 alloy steel contains .43 percent or 43 points of the element carbon and solution. True or false.