Compute (a) the mass fraction of proeutectoid ferrite and (b) the mass fraction of pearlite that form in an iron-carbon alloycontaining 0.30 wt% C. The iron-iron carbide phase diagram is shown in the Animated Figure 9.24.(a) i(b) i Temperature (°C)1600140012001000800600400(Fe)5-1493 °C1538 °C1394 °Ca+yy, Austenite912 °C0.760.022, Feritte1085 °C1y + L2Composition (at% C)10152.141147 °Ca + Fe₂ C3Composition (wt%LComposition = 0 wt% CComposition = 0 at% CTemperature = 400 °CTemperature = 752 °F4.30y + Fe3C727 °C20Cementite (Fe,C)562525002000150010006.70Temperature (°F)

It is required to determine the mass fraction of the (a) proeutectiod ferrite and (b) pearlite in…

Compute (a) the mass fraction of proeutectoid ferrite and (b) the mass fraction of pearlite that form in an iron-carbon alloy containing 0.30 wt% C. The iron-iron carbide phase diagram is shown in the Animated Figure 9.24. (a) i (b) i

Compute (a) the mass fraction of proeutectoid ferrite and (b) the mass fraction of pearlite that form in an iron-carbon alloy containing 0.30 wt% C. The iron-iron carbide phase diagram is shown in the Animated Figure 9.24. (a) i (b) i

Welding: Principles and Applications (MindTap Course List)

8th Edition

ISBN:9781305494695

Author:Larry Jeffus

Publisher:Larry Jeffus

Chapter26: Welding Metallurgy

Section: Chapter Questions

Problem 12R: What is a eutectic composition?

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Question

Compute (a) the mass fraction of proeutectoid ferrite and (b) the mass fraction of pearlite that form in an iron-carbon alloy
containing 0.30 wt% C. The iron-iron carbide phase diagram is shown in the Animated Figure 9.24.
(a) i
(b) i

Temperature (°C)
1600
1400
1200
1000
800
600
400
(Fe)
5
-1493 °C
1538 °C
1394 °C
a+y
y, Austenite
912 °C
0.76
0.022
, Feritte
1085 °C
1
y + L
2
Composition (at% C)
10
15
2.14
1147 °C
a + Fe₂ C
3
Composition (wt%
L
Composition = 0 wt% C
Composition = 0 at% C
Temperature = 400 °C
Temperature = 752 °F
4.30
y + Fe3C
727 °C
20
Cementite (Fe,C)
5
6
25
2500
2000
1500
1000
6.70
Temperature (°F)

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