Degarmo's Materials And Processes In Manufacturing
13th Edition
ISBN: 9781119492825
Author: Black, J. Temple, Kohser, Ronald A., Author.
Publisher: Wiley,
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Chapter 2, Problem 60RQ
To determine
Materials thatshow ductile-to-brittle transition and those which do not showing.
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Q3: With a moderately agitated water, a cylindrical piece of steel with 80 mm diameter is to be quenched. The
hardnesses of the surface and center must be at least 55 and 40 HRC, respectively. Which of these alloys will
satisfy the following requirements: 1040, 5140, 4340, 4140, 8620, 8630, 8640, and 8660?
Cooling rate at 700c
Cooling rate at 700°c
170 70 31 18
5.6
3.9 "C
270 170 70 31 18 9
60
2 "Os
5.6
3.9
2.8
100
100
50
4340
80
75
3
Surface
40
4140
Center
8640
30
5140
25
1040
20
10
20
30
40
50 mm
10
20
30 mm
Distance from quenched end
Equivalent distance from quenched end
Figure 3
Figure 4
Hardness, HRC
Percent martensite
Diameter of bar (mm)
Answer this please important
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
105
Time (s)
Temperature (°C)
Temperature (°F)
Chapter 2 Solutions
Degarmo's Materials And Processes In Manufacturing
Ch. 2 - Prob. 1RQCh. 2 - Provide two definitions of the termÂ...Ch. 2 - Knowledge of what four aspects and their...Ch. 2 - Give an example of how we might take advantage of...Ch. 2 - What are some of the possible property...Ch. 2 - What are some properties commonly associated with...Ch. 2 - What are some of the more common nonmetallic...Ch. 2 - What are some of the important physical properties...Ch. 2 - Why should caution be exercised when applying the...Ch. 2 - What are the standard units used to report stress...
Ch. 2 - What are static properties?Ch. 2 - What is the most common static test to determine...Ch. 2 - What is engineering stress? Engineering strain?...Ch. 2 - What is Youngs modulus or stiffness, and why might...Ch. 2 - What are some of the tensile test properties that...Ch. 2 - Why is it important to specify the offset when...Ch. 2 - How is the offset yield strength determined?Ch. 2 - During the plastic deformation portion of a...Ch. 2 - What are the test conditions associated with...Ch. 2 - How would the tensile test curves differ for a...Ch. 2 - What are two tensile test properties that can be...Ch. 2 - What is uniform elongation, and when might it be...Ch. 2 - Is a brittle material a weak material? What does...Ch. 2 - What is the toughness of a material, and how might...Ch. 2 - What is the difference between true stress and...Ch. 2 - Explain how the plastic portion of a true...Ch. 2 - What is strain hardening or work hardening? How...Ch. 2 - Give examples of applications utilizing high...Ch. 2 - How might tensile test data be misleading for a...Ch. 2 - What type of tests can be used to determine the...Ch. 2 - What are some of the different material...Ch. 2 - What units could be applied to the Brinell...Ch. 2 - Although the Brinell hardness test is simple and...Ch. 2 - What are the similarities and differences between...Ch. 2 - Why are there different Rockwell hardness scales?Ch. 2 - How might hardness tests be used for quality...Ch. 2 - What are the attractive features of the Vickers...Ch. 2 - When might a microhardness test be preferred over...Ch. 2 - What is the attractive feature of the Knoop...Ch. 2 - Why might the various types of hardness tests fail...Ch. 2 - What is the relationship between penetration...Ch. 2 - Describe several types of dynamic loading.Ch. 2 - Why should the results of standardized dynamic...Ch. 2 - What are the two most common types of bending...Ch. 2 - What aspects or features can significantly alter...Ch. 2 - What is notch�sensitivity, and how might it be...Ch. 2 - Which type of dynamic condition accounts for...Ch. 2 - Are the stresses applied during a fatigue test...Ch. 2 - Is a fatigue S–N curve determined from a...Ch. 2 - What is the endurance limit? What occurs when...Ch. 2 - What features may significantly alter the fatigue...Ch. 2 - What relationship can be used to estimate the...Ch. 2 - Describe the growth of a fatigue crack.Ch. 2 - What material, design, or manufacturing features...Ch. 2 - How might the relative sizes of the fatigue region...Ch. 2 - What are fatigue striations, and why do they form?Ch. 2 - Why is it important for a designer or engineer to...Ch. 2 - What mechanical property changes are typically...Ch. 2 - Prob. 59RQCh. 2 - Prob. 60RQCh. 2 - How might the orientation of a piece of metal...Ch. 2 - How might we evaluate the long�term effect of...Ch. 2 - Prob. 63RQCh. 2 - What is a stress–rupture diagram, and how is one...Ch. 2 - Why are terms such as machinability, formability,...Ch. 2 - Prob. 66RQCh. 2 - What are some of the types of flaws or defects...Ch. 2 - What three principal quantities does fracture...Ch. 2 - What is a dormant flaw? A dynamic flaw? How do...Ch. 2 - How is fracture mechanics applied to fatigue...Ch. 2 - What are the three most common thermal properties...Ch. 2 - Describe an engineering application where the...Ch. 2 - Why is it important that property testing be...Ch. 2 - Why is it important to consider the orientation of...Ch. 2 - Select a product or component for which physical...Ch. 2 - Repeat Problem 1 for a product or component...Ch. 2 - Repeat Problem 1 for a product or component...Ch. 2 - A fuel tanker or railroad tanker car has been...Ch. 2 - One of the important considerations when selecting...Ch. 2 - Several of the property tests described in this...Ch. 2 - Steel and aluminum cans that have been submitted...Ch. 2 - Prob. 2CSCh. 2 - Prob. 3CSCh. 2 - Prob. 4CSCh. 2 - Prob. 5CSCh. 2 - Prob. 6CSCh. 2 - Mixed plastic consisting of recyclable...Ch. 2 - What do you suspect is the cause of these...Ch. 2 - Prob. bCSCh. 2 - Prob. cCS
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Similar questions
- When does stress concentration occur?arrow_forwardWhich of the following phase will be resulted when the transformation temperature of steel is more than 750 °C? *arrow_forwardIt is a hammer made of carbon steel and forged to shape and size heat-treated to make the striking faces hard [(a soft hammer (b) ball-peen hammer (d)hard hammerarrow_forward
- The cooling rate (in °C/s) at the center of a shaft with diameter d (in mm) is given by the following formula log 10(CR) -1.8024 log 10(d) + 4.0565 %3D and the critical cooling rate (CCR in °C/s) of low alloys steels is given as a function of amount of alloying element (in wt%6) as follow. log 10(CCR)= 4.3-3.27×C- (Mn + Cr+Mo+ Ni) 1.6 Find the maximum diameter (in mm) of a shaft to be made of alloy A (such that 100% martensite will be produced after quenching) from the following table is given below: Alloy Weight Percentage (wr%) Mn Cr Mo Ni A 03 08 05 02 055 0.4 0.6 1.2 0.3 5 0 36 0.7 15 255 0.4 06 12 0.15 5 0 41 0 85o 5 o 25 o s5 04 0.65 0 75 0 25 p.85arrow_forwardPlease respond asap.....arrow_forwardQ1: 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_forward
- Can someone please help me to answer the following question completely. PLEASE AND THANK YOU!!!arrow_forward1. Using the TTT diagram for Eutectoid Steel, specify the constituents and their approximate percentages of a small specimen subjected to the following time-temperature treatments. All begin with a completely Austenized specimen: - Rapidly cool to 650°C, hold for 100 seconds, then quench to room temperature. Rapidly cool to 500°C, hold for 100 seconds, then quench to room temperature. - Rapidly cool to 350°C, hold for 100 seconds, then quench to room temperature. - Rapidly cool to 100°C, hold for 100 seconds, then quench to room temperature. - Rapidly cool to 500°C, hold for 4 seconds, quench to 300°C, hold for 200 seconds, then quench to room temperature.arrow_forwardDiscuss the heat treatment process which uses rapid cooling of steel in oil or molten salt bath?arrow_forward
- What does the process of temper drying do for hardened carbon steel?arrow_forwardDiscuss the effects of cooling rate on steel hardness when the sample experienced: Rapid cooling Slow coolingarrow_forwardLook at the Cooling Curves Superimposed on a TTT diagram below. Then, match the correct cooling curve to the description. (NOTE: image is attached and the area that needs answering is also attached as a photo)arrow_forward
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