Current Attempt in Progress Using the Animated Figure 10.40, the isothermal transformation diagram for a 0.45 wt% C steel alloy, specify the nature of the final microstructure (in terms of the microconstituents present) of a small specimen that has been subjected to the following temperature treatments. In each case assume that the specimen begins at 845 °C and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. a) Rapidly cool to 700 degrees C, hold for 100,000 s, then quench to room temperature.

Structural Analysis
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Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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Time = 1 · 10E-1 s
Temperature = 0 °C
Temperature = 32 °F
%3D
900
1600
800
A +F
1400
A
700
1200
A + P
600
В
1000
500
FA+B
800
50%
400
M (start)
M (50%)
600
300
M (90%)
200
400
100
200
이1
1
10
102
103
104
105
Time (s)
Temperature (°C)
Temperature (°F)
Transcribed Image Text:Time = 1 · 10E-1 s Temperature = 0 °C Temperature = 32 °F %3D 900 1600 800 A +F 1400 A 700 1200 A + P 600 В 1000 500 FA+B 800 50% 400 M (start) M (50%) 600 300 M (90%) 200 400 100 200 이1 1 10 102 103 104 105 Time (s) Temperature (°C) Temperature (°F)
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Current Attempt in Progress
Using the Animated Figure 10.40, the isothermal transformation diagram for a 0.45 wt% C steel alloy, specify the nature of the final
microstructure (in terms of the microconstituents present) of a small specimen that has been subjected to the following
temperature treatments. In each case assume that the specimen begins at 845 °C and that it has been held at this temperature long
enough to have achieved a complete and homogeneous austenitic structure.
a) Rapidly cool to 700 degrees C, hold for 100,000 s, then quench to room temperature.
b) Rapidly cool to 450 degrees C, hold for 10 s, then quench to room temperature.
proeutectoid ferrite + pearlite
proeutectoid ferrite + martensite
proeutectoid ferrite + pearlite + martensite
eT
proeutectoid ferrite + pearlite + bainite + martensite
all spheroidite
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all bainite
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all martensite
bainite + martensite
Transcribed Image Text:View Policies Current Attempt in Progress Using the Animated Figure 10.40, the isothermal transformation diagram for a 0.45 wt% C steel alloy, specify the nature of the final microstructure (in terms of the microconstituents present) of a small specimen that has been subjected to the following temperature treatments. In each case assume that the specimen begins at 845 °C and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. a) Rapidly cool to 700 degrees C, hold for 100,000 s, then quench to room temperature. b) Rapidly cool to 450 degrees C, hold for 10 s, then quench to room temperature. proeutectoid ferrite + pearlite proeutectoid ferrite + martensite proeutectoid ferrite + pearlite + martensite eT proeutectoid ferrite + pearlite + bainite + martensite all spheroidite Save all bainite Attempts: 0 of 5 used Submit Answer all martensite bainite + martensite
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