Construction Materials, Methods and Techniques (MindTap Course List)
4th Edition
ISBN: 9781305086272
Author: William P. Spence, Eva Kultermann
Publisher: Cengage Learning
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Textbook Question
Chapter 15, Problem 1RQ
What is the key element that influences the properties of iron?
Expert Solution & Answer
To determine
The key element that influence the properties of iron
Answer to Problem 1RQ
Alloying element influence the properties of iron
Explanation of Solution
Iron is found in the earth’s crust in large quantities. It is pure, ductile and has good magnetic properties but undergoes rusting easily. To improve the characteristics of iron, alloying elements are added to it so that it can be used commercially. Elements like manganese, sulfur, silicon and phosphorus are added to iron.
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A steel, possessing an eutectoid composition, undergoes a gradual cooling process from 800°C to
600°C. Outline the transformation, equilibrium microstructure, and provide approximate component
proportions.
Describe the resultant non-equilibrium microstructure in two scenarios:
a) the steel is rapidly cooled from 800°C to 600°C within 1 s, and then held at such temperature;
b) the steel is rapidly cooled from 800°C to 600°C within 1 s, maintained at this temperature for
5 s, and subsequently quenched to room temperature.
Use the provided diagrams.
Temperature (°C)
1600
1538°C
1493°C
1400
L
1394°C
Y+L
1200-
1147°C
2.14
Y. Austenite
4.30
1000
912°C
Y+ FeC
800
a
600
400
0
(Fe)
0.76
0.022
a, Ferrite
2
a + Fe3C
3
Composition (wt% C)
727°C
Cementite (Fe3C)
4
5
6
6.7
Chapter 15 Solutions
Construction Materials, Methods and Techniques (MindTap Course List)
Ch. 15 - What is the key element that influences the...Ch. 15 - Prob. 2RQCh. 15 - Prob. 3RQCh. 15 - Prob. 4RQCh. 15 - What are the commonly produced cast irons?Ch. 15 - What are the main properties of white cast iron?Ch. 15 - Why is malleable cast iron less brittle than white...Ch. 15 - How does the alloying element nickel affect the...Ch. 15 - If steel has a carbon content less than 0.90...Ch. 15 - Prob. 14RQ
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