10.19 Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition (Figure 10.23), specify the nature of the final microstructure (in terms of microconstituents present and approximate percentages of each) of a small specimen that has been subjected to the following time-temperature treatments. In each case assume that the specimen begins at 760°C (1400°F) and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. (a) Cool rapidly to 700°C (1290°F), hold for 104 s, then quench to room temperature. (b) Reheat the specimen in part (a) to 700°C (1290°F) for 20 h. (c) Rapidly cool to 600°C (1110°F), hold for 4 s, rapidly cool to 450°C (840°F), hold for 10 s, then quench to room temperature.
10.19 Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition (Figure 10.23), specify the nature of the final microstructure (in terms of microconstituents present and approximate percentages of each) of a small specimen that has been subjected to the following time-temperature treatments. In each case assume that the specimen begins at 760°C (1400°F) and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. (a) Cool rapidly to 700°C (1290°F), hold for 104 s, then quench to room temperature. (b) Reheat the specimen in part (a) to 700°C (1290°F) for 20 h. (c) Rapidly cool to 600°C (1110°F), hold for 4 s, rapidly cool to 450°C (840°F), hold for 10 s, then quench to room temperature.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
Related questions
Question
Transcribed Image Text:10.19 Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid
composition (Figure 10.23), specify the nature of the final microstructure (in terms of
microconstituents present and approximate percentages of each) of a small specimen that
has been subjected to the following time-temperature treatments. In each case assume that
the specimen begins at 760°C (1400°F) and that it has been held at this temperature long
enough to have achieved a complete and homogeneous austenitic structure.
(a) Cool rapidly to 700°C (1290°F), hold for 104 s, then quench to room temperature.
(b) Reheat the specimen in part (a) to 700°C (1290°F) for 20 h.
(c) Rapidly cool to 600°C (1110°F), hold for 4 s, rapidly cool to 450°C (840°F), hold for
10 s, then quench to room temperature.
(d) Cool rapidly to 400°C (750°F), hold for 2 s, then quench to room temperature.
(e) Cool rapidly to 400°C (750°F), hold for 20 s, then quench to room temperature.
(f) Cool rapidly to 400°C (750°F), hold for 200 s, then quench to room temperature.
(g) Rapidly cool to 575°C (1065°F), hold for 20 s, rapidly cool to 350°C (660°F), hold for
100 s, then quench to room temperature.
(h) Rapidly cool to 250°C (480°F), hold for 100 s, then quench to room temperature in
water. Reheat to 315°C (600°F) for 1 h and slowly cool to room temperature.
Transcribed Image Text:Temperature (°C)
800
700
600
500
400
300
200
100
0
10-1
A
A
A
M (start)
M (50%)
M (90%)
1
4x-a
10
Eutectoid temperature
M+A
10²
Time (s)
B
50%
103
Answer every part please, thank you.
10⁰
1400
1200
1000
800
600
400
200
105
Temperature (°F)
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 4 steps with 4 images
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Recommended textbooks for you
Elements Of Electromagnetics
Mechanical Engineering
ISBN:
9780190698614
Author:
Sadiku, Matthew N. O.
Publisher:
Oxford University Press
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:
9780134319650
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:
9781259822674
Author:
Yunus A. Cengel Dr., Michael A. Boles
Publisher:
McGraw-Hill Education
Elements Of Electromagnetics
Mechanical Engineering
ISBN:
9780190698614
Author:
Sadiku, Matthew N. O.
Publisher:
Oxford University Press
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:
9780134319650
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:
9781259822674
Author:
Yunus A. Cengel Dr., Michael A. Boles
Publisher:
McGraw-Hill Education
Control Systems Engineering
Mechanical Engineering
ISBN:
9781118170519
Author:
Norman S. Nise
Publisher:
WILEY
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:
9781337093347
Author:
Barry J. Goodno, James M. Gere
Publisher:
Cengage Learning
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:
9781118807330
Author:
James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:
WILEY