Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Chapter 9.13, Problem 78AAP
(a)
To determine
Express the Rockwell C hardness for 80mm diameter 4340 steel bar at its surface.
(b)
To determine
Express the Rockwell C hardness for 60mm diameter 4140 long steel bar at its center.
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Students have asked these similar questions
A nitriding heat treatment of a BCC steel normally requires 2 h at 600 °C. What temperature would be required to reduce the heat treatment time to 1 h?(Q =76570 J/mol, Do =0.0047x10- 4 m2/s)
Q1: Austenitized 40 mm diameter 5140 alloy steel bar is quenched in agitated oil. Predict what is the
Rockwell hardness of this bar will be at (a) its surface and (b) its center (c) What do you think about
the difference in hardness number between the center and surface (d) Differentiate between hardness
and hardenability (e) Rank the steels in the figure below from lowest to highest hardenability and
explain why.
Cooling rate at 700°C (°C/sec)
300
150
011/3 55
100
600
Bar diameter (mm)
80
60
40
20
0
OLL
0
0
ww
25 12.5 8
5
S
--------------
M-R
10
3/4-R
Agitated oil
15 20
1/4
3/4
Distance from quenched end. De
(Jominy distance)
5.5
4
3
Bar diameter (in.)
0
25 mm
1 in.
Hardness (Rockwell C)
Where (C = center, S = surface, M-R mid-radius)
65
60
55
50
45
40
35
30
25
20
15
10
0
10
1
20
Distance from quenched end (mm)
5140
1
30
L
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32
Distance from quenched end (sixteenths of an inch)
4340
40
9840
4140
8640
50
A 609 g eutectoid steel ( about 0.8%C) is heated to 1,002 C and cooled slowly through the eutectorid temperature. This results in the formation of cementite Fe3C (6.67%C) and ferrite (0.025%C). Calculate the number of grams of cementite that form in the steel.
Chapter 9 Solutions
Foundations of Materials Science and Engineering
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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.Similar questions
- Q1: Austenitized 40 mm diameter 5140 alloy steel bar is quenched in agitated oil. Predict what is the Rockwell hardness of this bar will be at (a) its surface and (b) its center (c) What do you think about the difference in hardness number between the center and surface (d) Differentiate between hardness and hardenability (e) Rank the steels in the figure below from lowest to highest hardenability and explain why. 600- Bar diameter (mm) 100 80 60 40 20 0 300 0 Cooling rate at 700°C (°C/sec). -150 55 0 تنا 25 ------- 5 S 10 12.5 8 M-R L 1/2 34-R Agitated oil 15 20 ¼ ¾ Distance from quenched end. De (Jominy distance) 5,5 54 Car Bar diameter (in.) 0 25 mm. 1 in. Hardness (Rockwell C) Where (C = center, S = surface, M-R = mid-radius) 2828 292 65 60- 55- 50 45 40 35 30 25 20 15 10 0 J 10 5140 30 20 Distance from quenched end (mm) 4340 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Distance from quenched end (sixteenths of an inch) 40 9840 4140 8640 50arrow_forwardA nitriding heat treatment of a BCC steel normally requires 2 h at 600 °C. What temperature would be required to reduce the heat treatment time to 1 h?(Q =76570 J/mol, Do =0.0047x10- 4 m2/s) and the last one. thanks for ur helping.arrow_forwardThe isothermal transformation diagram for and iron- carbon alloy of eutectoid composition is given in figure. 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. Show your work on the diagram. a. Cool rapidly to 300°C, hold for 5 s. b. Cool rapidly to 600°C hold for 100 s, then quench to room temperature. C. Cool rapidly to 500°C, hold for 7 s, and then quench to room temperature. Temperature (°C) 800 700 600 500 400 300 200 100 0 -1 10 6 A A A M(start) M(50%) M(90%) 1 10 M-A Eutectoid temperature P 10² Time (s) B 50% 10³ 104 105arrow_forward
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