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Question 3 (a) Figure Q3 below shows the Iron-Iron Carbide phase diagram. Consider a steel with a 99.0 wt% Fe 1.0 wt% C composition. Consider cooling of this steel from high temperature (1600°C) under equilibrium conditions and answer the following: i. At what temperature will the steel be completely solidified, and identify this solid phase? [2] ii. iii. iv. V. [1] At what temperature will Cementite begin to form in the solid steel? Sketch and describe the microstructure, at a temperature just below the eutectoid, and state whether this is a Hypo-Eutectoid or Hyper-Eutectoid steel. Calculate the wt% of both Pearlite and pro-eutectoid Cementite, at a temperature just below the eutectoid. [4] [3] Calculate the wt% of both a and Cementite phases, at a temperature just below the eutectoid. [3] Temperature (°C) 1600 1538°C 1493°C 1400 $\delta$ L 2500 1394°C $\gamma$+L 1200 1147°C $\gamma$, Austenite 2.14 4.30 2000 1000 912°C $\gamma$ + $Fe_3C$ 800 $\alpha$ + $\gamma$ 600 0.76 0.022 $\alpha$, Ferrite $\alpha$ + $Fe_3C$ 727°C 1500 Cementite ($Fe_3C$) 1000 400 0 (Fe) 1 2 3 4 5 6 6.70 Composition (wt% C) Figure Q3 Temperature (°F)

          Question 3
(a) Figure Q3 below shows the Iron-Iron Carbide phase diagram. Consider a steel with a 99.0
wt% Fe 1.0 wt% C composition. Consider cooling of this steel from high temperature
(1600°C) under equilibrium conditions and answer the following:
i. At what temperature will the steel be completely solidified, and identify this solid
phase?
[2]
ii.
iii.
iv.
V.
[1]
At what temperature will Cementite begin to form in the solid steel?
Sketch and describe the microstructure, at a temperature just below the eutectoid, and
state whether this is a Hypo-Eutectoid or Hyper-Eutectoid steel.
Calculate the wt% of both Pearlite and pro-eutectoid Cementite, at a temperature just
below the eutectoid.
[4]
[3]
Calculate the wt% of both a and Cementite phases, at a temperature just below the
eutectoid.
[3]
Temperature (°C)
1600
1538°C
1493°C
1400
$\delta$
L
2500
1394°C
$\gamma$+L
1200
1147°C
$\gamma$, Austenite
2.14
4.30
2000
1000
912°C
$\gamma$ + $Fe_3C$
800
$\alpha$
+
$\gamma$
600
0.76
0.022
$\alpha$, Ferrite
$\alpha$ + $Fe_3C$
727°C
1500
Cementite ($Fe_3C$)
1000
400
0
(Fe)
1
2
3
4
5
6
6.70
Composition (wt% C)
Figure Q3
Temperature (°F)

question 3 a figure q3 below shows the iron iron carbide phase diagram consider a steel with a 990 wt fe 10 wt c composition consider cooling of this steel from high temperature 1600c under 26405

Added by Eugenia H.

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