EBK MANUFACTURING PROCESSES FOR ENGINEE
6th Edition
ISBN: 9780134425115
Author: Schmid
Publisher: YUZU
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Chapter 3, Problem 3.47P
To determine
The strip that has the rate of recrystallization effect at lowest temperature.
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A 20 foot long x 4 feet wide x ½ inch thick sheet of an aluminum alloy is cold rolled to a thickness of ¼ inch. During the rolling operation the with of the sheet increases by 10%. The strength coefficient (K) and the strain hardening coefficient (n ) for the aluminum alloy are 25,500 psi and 0.3, respectively.
Calculate the length of the sheet after the rolling operation in feet.
A cylindrical brass rod with a minimum tensile strength of 450 MPa, a ductility of at least 13% EL (elongation), and a final diameter of 12.7mm is required. You have in your inventory some 19.0mm diameter brass stock that has been cold worked to 35%. Assuming that the cross section of the rod is still circular after being cold worked, and that brass experiences cracking at 65% CW, describe the necessary working steps in order to achieve the final product. Take the expression for % cold work to be = (Ao - Af)/ Ao x 100%, where Ao and Af are the original and final circular cross-sectional areas of the rod.
Question-2
If it takes 12.0 min to 50% recrystallize a piece of high-purity copper sheet at 140°C and 200 min at 88°C, how
many minutes are required to recrystallize the sheet 50% percent at 100°C? Assume an Arrhenius-type rate
behavior.
Chapter 3 Solutions
EBK MANUFACTURING PROCESSES FOR ENGINEE
Ch. 3 - Prob. 3.1QCh. 3 - Prob. 3.2QCh. 3 - Prob. 3.3QCh. 3 - Prob. 3.4QCh. 3 - Prob. 3.5QCh. 3 - Prob. 3.6QCh. 3 - Prob. 3.7QCh. 3 - Prob. 3.8QCh. 3 - Prob. 3.9QCh. 3 - Prob. 3.10Q
Ch. 3 - Prob. 3.11QCh. 3 - Prob. 3.12QCh. 3 - Prob. 3.13QCh. 3 - Prob. 3.14QCh. 3 - Prob. 3.15QCh. 3 - Prob. 3.16QCh. 3 - Prob. 3.17QCh. 3 - Prob. 3.18QCh. 3 - Prob. 3.19QCh. 3 - Prob. 3.20QCh. 3 - Prob. 3.21QCh. 3 - Prob. 3.22QCh. 3 - Prob. 3.23QCh. 3 - Prob. 3.24QCh. 3 - Prob. 3.25QCh. 3 - Prob. 3.26QCh. 3 - Prob. 3.27QCh. 3 - Prob. 3.28QCh. 3 - Prob. 3.29QCh. 3 - Prob. 3.30QCh. 3 - Prob. 3.31QCh. 3 - Prob. 3.32QCh. 3 - Prob. 3.33QCh. 3 - Prob. 3.34QCh. 3 - Prob. 3.35QCh. 3 - Prob. 3.36QCh. 3 - Prob. 3.37QCh. 3 - Prob. 3.38QCh. 3 - Prob. 3.39QCh. 3 - Prob. 3.40QCh. 3 - Prob. 3.41QCh. 3 - Prob. 3.42QCh. 3 - Prob. 3.43PCh. 3 - Prob. 3.44PCh. 3 - Prob. 3.45PCh. 3 - Prob. 3.46PCh. 3 - Prob. 3.47PCh. 3 - Prob. 3.48PCh. 3 - Prob. 3.49PCh. 3 - Prob. 3.50PCh. 3 - Prob. 3.51PCh. 3 - Prob. 3.52PCh. 3 - Prob. 3.53PCh. 3 - Prob. 3.54P
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- After a machinist quickly slips a hot, snugly fitting iron ring over a very cold brass cylinder, the two cannot be separated intact. Can you explain why this is so?arrow_forwardIn cold working, the metals can be deformed permanently after applying the forming forces. Select one: True Falsearrow_forwardA 20 foot long x 4 feet wide x ½ inch thick sheet of an aluminum alloy is cold rolled to a thickness of ¼ inch. During the rolling operation the with of the sheet increases by 10%. The strength coefficient (K) and the strain hardening coefficient (n ) for the aluminum alloy are 25,500 psi and 0.3, respectively Calculate the true strain at the end of the rolling process.arrow_forward
- Example Problem-2 A cylindrical rod of non cold-worked brass having an initial diameter of 6.4 mm (0.25 in.) is to be cold worked by drawing such that the cross-sectional area is reduced. It is required to have a cold-worked yield strength of at least 345 Mpa (50,000 psi) and a ductility in excess of 20%EL; in addition, a final diameter of 5.1 mm (0.20 in.) is necessary. Describe the solution.arrow_forwardAn annealed copper strip 9 in wide having .2 K=80,000 psi, N=0.60, and a height of 1 in _was flat rolled to a height of 0.90 in with 12 in roller radius rotating at 120 rpm a) Calculate the force and the power .needed to operate this Processarrow_forwardA copper plate was cold rolled and according to metallographic examination "elongated grains" were not seen in rolling direction. How can you explain thisarrow_forward
- why use yield strength not tensile strength? You are drawing wire which you want the wire to elongate pernamently, and not return back to original shape .arrow_forwardWe wish to produce a 0.3 inch thick plate of 3105 aluminum having a tensile strength of at least 25,000 psi and an elongation of at least 5%. The original thickness of the plate is 3 inches. The maximum cold work in each step is 85%. Which of the following procedures would achieve the correct final properties (more than one answer is possible!)? Group of answer choices Hot work from 3 in to 0.7 in; cold work from 0.7 in to 0.3 in Cold work from 3 in to 0.7 in; do an anneal to recrystallize the material; cold work from 0.7 in to 0.3 in Cold work from 3 inches to 0.3 inches Cold work from 3 in to 0.7 in; cold work from 0.7 to 0.5 in; do an anneal to recrystallize the material; cold work from 0.5 in to 0.3 in Hot work from 3 in to 0.5 in; do an anneal to recrystallize the material; hot work from 0.5 to 0.3 in Hot work from 3 in to 0.7 in; do an anneal to recrystallize the material; hot work from 0.7 to 0.3 in Cold work from 3 in to 0.5 in; do an anneal to recrystallize the…arrow_forwardpart made from AISI 1212 steel undergoes a 20 percent cold-work operation. (a) Obtain the yield strength and ultimate strength before and after the cold-work operation. Determine the percent increase in each strength. (b) Determine the ratios of ultimate strength to yield strength before and after the cold work operation. What does the result indicate about the change of ductility of the part?arrow_forward
- 1. Explain in 1-3 bullets how as a practicing engineer you determine the yield strength of a metal from a tensile stress-strain curve. 2. Explain what is happening at the yield strength for a metal from a physical standpoint in 1-3 bullets. (e.g. what are the atoms doing?)arrow_forward5) A steel specimen of rectangular cross section with 120 mm width, 180 mm thickness and 90 mm height was upset at room temperature by open-die forging to a height of 55 mm. If the strength coefficient and strain hardening exponent of this material were 1015 MPa and 0.17 respectively, the coefficient of friction is 0.2, and assuming that the thickness would not change during forging; determine the required upsetting force at the end of stroke.arrow_forwardConsider the tensile stress strain curves in Figure 8-20 labeled 1 and 2 and answer the following questions. These curves are typical of metals. Consider each part as a separate question that has no relationship to previous parts of the question. (a) Which material has the larger work hardening exponent? How do you know? (b) Samples 1 and 2 are identical except that they were tested at different strain rates. Which sample was tested at the higher strain rate? How do you know? (c) Assume that the two stress strain curves represent successive tests of the same sample. The sample was loaded, then unloaded before necking began, and then the sample was reloaded. Which sample represents the first test: 1 or 2? Haw do you know?arrow_forward
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