Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Question
Chapter 9.13, Problem 23KCP
(a)
To determine
What is an aging curve for a precipitation-hardenable alloy?
(b)
To determine
What types of precipitates are developed in an alloy that is considerably underaged at low temperatures?
(c)
To determine
What types are developed upon overaging?
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13- Copper-rich copper-beryllium alloys are precipitation hardenable. After consulting the portion of the phase
diagram shown in the figure below, do the following:
(a) Specify the range of compositions over which these alloys may be precipitation hardened.
Temperature (°C)
(b) Briefly describe the heat-treatment procedures steps (in terms of temperatures) that would be used to
precipitation harden an alloy having a composition of 1 wt% Be.
1000
800
600
400
0
(Cu)
0
1
Composition (at% Be)
10
15
a + L
2
α + 1/2
Liquid
Composition (wt% Be)
866°C
-620°C
3
20
x + 1₁
1. Given the time-temperature transformation diagram, what would be the phases present for a 1.13 wt. % C steel with no alloying elements. calculate the amount of pro eutectoid product, where applicable (at the bottom)
A) quenched in cold water to 650 C in 0.1 seconds, then held at 650 C for 5 seconds, then quenched to 400 C, held at 400C for 60 seconds, and finally quenched to room temperature
B. Necessary Steel Phase Diagram Calculations to determine the amount of pro eutectoid product:
Identify the components temperature and approximate composition (of wt.% C) at which the peritectic transformation occurs in Fe-C alloys. Explain why delta-ferrite is not expected to be retained on equilibrium cooling a steel of this composition through the invariant reaction.
Chapter 9 Solutions
Foundations of Materials Science and Engineering
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