Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Chapter 9.13, Problem 74AAP
Thin pieces of 0.3-mm-thick hot-rolled strips of 1080 steel are heat-treated in the following ways. Use the IT diagram of Figure 9.23 and other knowledge to determine the microstructure of the steel samples after each heat treatment.
- a. Heat 1 h at 860°C; water-quench.
- b. Heat 1 h at 860°C; water-quench; reheat 1 h at 350°C. What is the name of this heat treatment?
- c. Heat 1 h at 860°C; quench in molten salt bath at 700°C and hold 2 h; water-quench.
- d. Heat 1 h at 860°C; quench in molten salt bath at 260°C and hold 1 min; air-cool. What is the name of this heat treatment?
- e. Heat 1 h at 860°C; quench in molten salt bath at 350°C; hold 1 h; and air-cool. What is the name of this heat treatment?
- f. Heat 1 h at 860°C; water-quench; and reheat 1 h at 700°C.
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Question-6
A 0.25% C hypoeutectoid plain-carbon steel is slowly cooled from 950°C to a temperature just
slightly below 723°C.
(a) Calculate the weight percent proeutectoid ferrite in the steel.
(b) Calculate the weight percent eutectoid ferrite and weight percent eutectoid cementite in the
steel.
Q1: 1.5 in diameter steel part is quenched in oil with no agitation. (H=0.20). If we use a 4340; 4140; 8640; 5140; 1040 steel, what would be the hardness number at the center of the part?
Q2: Determine the best quenching medium to produce a minimum hardness of HRC 40 at the center of a 3.75 cm diameter 4320 steel bar.
The TTT diagram for a 1076 eutectoid steel is given: What is the heat treatment process to form
50% Coarse Pearlite + 50% Martensite.
800
A
1400
Eutectoid temperature
700
A
1200
600
1000
500
800
400
A
600
300
M(start)
200
50%
400
M + A
M(50%)
M(90%)
100
200
10-1
1
10
102
103
104
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Chapter 9 Solutions
Foundations of Materials Science and Engineering
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