Identify the microstructure formed in the steel alloy based on the TTT-Diagram above after each heat treatment step (a) The steel is rapidly cooled or quenched from 800 °C to 580 °C, and then held for 60 sec, and slowly cooled to room temperature (b) Cooled to 500 °C, held for 3 sec, and rapidly cooled to room temperature (c) Cooled to 400 °C, held for 50 sec, and then rapidly cooled to room temperature.
Identify the microstructure formed in the steel alloy based on the TTT-Diagram above after each heat treatment step (a) The steel is rapidly cooled or quenched from 800 °C to 580 °C, and then held for 60 sec, and slowly cooled to room temperature (b) Cooled to 500 °C, held for 3 sec, and rapidly cooled to room temperature (c) Cooled to 400 °C, held for 50 sec, and then rapidly cooled to room temperature.
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Transcribed Image Text:2. Identify the microstructure formed in the steel alloy based on the TTT-Diagram above after each
heat treatment step
(a) The steel is rapidly cooled or quenched from 800 °C to 580 °C, and then held for 60 sec, and
slowly cooled to room temperature
(b) Cooled to 500 °C, held for 3 sec, and rapidly cooled to room temperature
(c) Cooled to 400 °C, held for 50 sec, and then rapidly cooled to room temperature.
Transcribed Image Text:800
A
Eutectoid temperature
700
A
1
600
1
500
8.
400
A
300
M(start)
200
M+ A
50%
M(50%)
M(90%)
100
10
10
102
103
104
105
Time (s)
-----
Temperature ("C)
1.
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