26) Given the T-T-T curve below, select the process that will result in a microstructure of nearly all bainite. a. Cool to 400°C, hold for 20 seconds, then quench to room temperature b. Cool to 500°C, hold for 10 seconds, then quench to room temperature c. Quench to 125°C, hold for 10 seconds, then reheat to 600°C for more than 100 seconds d. Cool to 725°C, hold for 1,000 seconds, then quench to 125°C e. Cool to 600°C, hold for 1 second, the quench to room temperature Temperature (°C) f. none of the above 900 800 H A+C 1600 1400 700- 1200 A+P 600 P 1000 500H A+B 800 400- Temperature (°F) 4 A 300- M(start) 200 M(50%) 100- M(90%) 600 50% T 0 1 10 102 103 10 105 106 Time (s) 400 200 27) Fatigue failure situations are typically dependent upon which combination of the following factors? a. Slip plane, slip direction, and orientation of the applied load b. Yield strength, elastic modulus, and ductility of the material c. Temperature, time, and applied stress d. Stress amplitude, frequency of loading, and number of cycles e. Flaw size, crack-tip radius, and Kic value of the material 28) Using the Fe-C phase diagram (included in the equation sheet), calculate the phase weight fraction of Fe3C expected in a pearlitic steel microstructure under equilibrium conditions assuming a bulk composition of 0.45 wt% carbon. a. 93.6 wt% Fe3C b. 66.3 wt% Fe3C c. 36.7 wt% Fe3C d. 6.4 wt% Fe3C e. 4.5 wt% Fe3C
26) Given the T-T-T curve below, select the process that will result in a microstructure of nearly all bainite. a. Cool to 400°C, hold for 20 seconds, then quench to room temperature b. Cool to 500°C, hold for 10 seconds, then quench to room temperature c. Quench to 125°C, hold for 10 seconds, then reheat to 600°C for more than 100 seconds d. Cool to 725°C, hold for 1,000 seconds, then quench to 125°C e. Cool to 600°C, hold for 1 second, the quench to room temperature Temperature (°C) f. none of the above 900 800 H A+C 1600 1400 700- 1200 A+P 600 P 1000 500H A+B 800 400- Temperature (°F) 4 A 300- M(start) 200 M(50%) 100- M(90%) 600 50% T 0 1 10 102 103 10 105 106 Time (s) 400 200 27) Fatigue failure situations are typically dependent upon which combination of the following factors? a. Slip plane, slip direction, and orientation of the applied load b. Yield strength, elastic modulus, and ductility of the material c. Temperature, time, and applied stress d. Stress amplitude, frequency of loading, and number of cycles e. Flaw size, crack-tip radius, and Kic value of the material 28) Using the Fe-C phase diagram (included in the equation sheet), calculate the phase weight fraction of Fe3C expected in a pearlitic steel microstructure under equilibrium conditions assuming a bulk composition of 0.45 wt% carbon. a. 93.6 wt% Fe3C b. 66.3 wt% Fe3C c. 36.7 wt% Fe3C d. 6.4 wt% Fe3C e. 4.5 wt% Fe3C
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
Related questions
Question
Transcribed Image Text:26) Given the T-T-T curve below, select the process that will result in a microstructure of nearly all
bainite.
a. Cool to 400°C, hold for 20 seconds, then quench to room temperature
b. Cool to 500°C, hold for 10 seconds, then quench to room temperature
c. Quench to 125°C, hold for 10 seconds, then reheat to 600°C for more than 100 seconds
d. Cool to 725°C, hold for 1,000 seconds, then quench to 125°C
e. Cool to 600°C, hold for 1 second, the quench to room temperature
Temperature (°C)
f.
none of the above
900
800 H
A+C
1600
1400
700-
1200
A+P
600
P
1000
500H
A+B
800
400-
Temperature (°F)
4
A
300-
M(start)
200
M(50%)
100- M(90%)
600
50%
T
0
1
10
102
103
10
105
106
Time (s)
400
200
27) Fatigue failure situations are typically dependent upon which combination of the following
factors?
a. Slip plane, slip direction, and orientation of the applied load
b. Yield strength, elastic modulus, and ductility of the material
c. Temperature, time, and applied stress
d. Stress amplitude, frequency of loading, and number of cycles
e. Flaw size, crack-tip radius, and Kic value of the material
28) Using the Fe-C phase diagram (included in the equation sheet), calculate the phase weight
fraction of Fe3C expected in a pearlitic steel microstructure under equilibrium conditions
assuming a bulk composition of 0.45 wt% carbon.
a. 93.6 wt% Fe3C
b. 66.3 wt% Fe3C
c.
36.7 wt% Fe3C
d. 6.4 wt% Fe3C
e. 4.5 wt% Fe3C
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 2 steps
Recommended textbooks for you
Structural Analysis (10th Edition)
Civil Engineering
ISBN:
9780134610672
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Principles of Foundation Engineering (MindTap Cou…
Civil Engineering
ISBN:
9781337705028
Author:
Braja M. Das, Nagaratnam Sivakugan
Publisher:
Cengage Learning
Structural Analysis (10th Edition)
Civil Engineering
ISBN:
9780134610672
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Principles of Foundation Engineering (MindTap Cou…
Civil Engineering
ISBN:
9781337705028
Author:
Braja M. Das, Nagaratnam Sivakugan
Publisher:
Cengage Learning
Fundamentals of Structural Analysis
Civil Engineering
ISBN:
9780073398006
Author:
Kenneth M. Leet Emeritus, Chia-Ming Uang, Joel Lanning
Publisher:
McGraw-Hill Education
Traffic and Highway Engineering
Civil Engineering
ISBN:
9781305156241
Author:
Garber, Nicholas J.
Publisher:
Cengage Learning