3.The TTT diagram of a plain carbon steel is given in Fig. 1. Identify whether this steel is a hypoeutectoid, eutectoid or hypereutectoid steel. Explain why the transformation happens slowly at 850°C as well as at 300°C. Determine the microstructures expected in this type of steel after the following heat treatment processes. a) Austenize at 900°C, quench to 400°C and hold for 1000 s and quench to 25°C. b) Austenize at 900°C, quench to 25°C. c) Austenize at 900°C, quench to 675°C and hold for 1 s, quench to 400°C and hold for 900 s and slowly cool to 25°C.
3.The TTT diagram of a plain carbon steel is given in Fig. 1. Identify whether this steel is a hypoeutectoid, eutectoid or hypereutectoid steel. Explain why the transformation happens slowly at 850°C as well as at 300°C. Determine the microstructures expected in this type of steel after the following heat treatment processes. a) Austenize at 900°C, quench to 400°C and hold for 1000 s and quench to 25°C. b) Austenize at 900°C, quench to 25°C. c) Austenize at 900°C, quench to 675°C and hold for 1 s, quench to 400°C and hold for 900 s and slowly cool to 25°C.
Elements Of Electromagnetics
7th Edition
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Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Question
![3.The TTT diagram of a plain carbon steel is given in Fig. 1. Identify whether this steel is a
hypoeutectoid, eutectoid or hypereutectoid steel. Explain why the transformation happens slowly
at 850°C as well as at 300°C.
Determine the microstructures expected in this type of steel after the following heat treatment
processes.
a) Austenize at 900°C, quench to 400°C and hold for 1000 s and quench to 25°C.
b) Austenize at 900°C, quench to 25°C.
c) Austenize at 900°C, quench to 675°C and hold for 1 s, quench to 400°C and hold for
900 s and slowly cool to 25°C.
900
Acm Cs
800
A1
FezC + Y
33
Fe3C + pearlite
45
700
Ps
600
++ Fe3C + pearlite
Y+ bainite
Bs
500
46
Bainite
400
Yu
Bf
300
57
Ms
200
60
Mf Y+ martensite
100
62
Martensite
102
65
103 104 105 106
0.1
1
10
Time (s)
Fig. 1
Temperature (°C)
Rockwell C hardness](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7ebb16f3-2e10-40f7-a224-72e636f0f119%2Fa8180875-e0dd-4365-b111-9e598d415a49%2F1yw2vsr_processed.jpeg&w=3840&q=75)
Transcribed Image Text:3.The TTT diagram of a plain carbon steel is given in Fig. 1. Identify whether this steel is a
hypoeutectoid, eutectoid or hypereutectoid steel. Explain why the transformation happens slowly
at 850°C as well as at 300°C.
Determine the microstructures expected in this type of steel after the following heat treatment
processes.
a) Austenize at 900°C, quench to 400°C and hold for 1000 s and quench to 25°C.
b) Austenize at 900°C, quench to 25°C.
c) Austenize at 900°C, quench to 675°C and hold for 1 s, quench to 400°C and hold for
900 s and slowly cool to 25°C.
900
Acm Cs
800
A1
FezC + Y
33
Fe3C + pearlite
45
700
Ps
600
++ Fe3C + pearlite
Y+ bainite
Bs
500
46
Bainite
400
Yu
Bf
300
57
Ms
200
60
Mf Y+ martensite
100
62
Martensite
102
65
103 104 105 106
0.1
1
10
Time (s)
Fig. 1
Temperature (°C)
Rockwell C hardness
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