EBK MANUFACTURING ENGINEERING & TECHNOL
7th Edition
ISBN: 8220100793431
Author: KALPAKJIAN
Publisher: PEARSON
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Textbook Question
Chapter 1, Problem 11RQ
What is the relationship between the nucleation rate and the number of grains per unit volume of a metal?
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What physical reasons why reducing grain size is an effective alternative for increasing the strength of a metal?
Which method do we use to monitor dislocation movements in tensile testing? How monitoring is done in this method, explain the working mechanism of the system in detail.
During the recrystallization of a cold-worked material, which of the following statement(s) is (are) true?
O There is some reduction in the number of dislocations.
O Some of the internal strain energy is relieved.
O The metal becomes more ductile, as in its precold-worked state.
O Grains with high strains are replaced with new, unstrained grains.
O There is a significant reduction in the number of dislocations, to approximately the number found in the precold-worked
state,
O The thermal conductivity is recovered to its precold-worked state.
O All of the internal strain energy is relieved.
O The electrical conductivity is recovered to its precold-worked state.
Chapter 1 Solutions
EBK MANUFACTURING ENGINEERING & TECHNOL
Ch. 1 - What is the difference between an atom and a...Ch. 1 - Prob. 2RQCh. 1 - Prob. 3RQCh. 1 - Prob. 4RQCh. 1 - Define anisotropy. What is its significance?Ch. 1 - What effects does recrystallization have on the...Ch. 1 - What is strain hardening, and what effects does it...Ch. 1 - Explain what is meant by structure-sensitive and...Ch. 1 - Prob. 9RQCh. 1 - What influence does grain size have on the...
Ch. 1 - What is the relationship between the nucleation...Ch. 1 - What is a slip system, and what is its...Ch. 1 - Explain the difference between recovery and...Ch. 1 - What is hot shortness, and what is its...Ch. 1 - Explain the advantages and limitations of cold,...Ch. 1 - Describe what the orange peel effect is. Explain...Ch. 1 - Some metals, such as lead, do not become stronger...Ch. 1 - Describe the difference between preferred...Ch. 1 - Differentiate between stress relaxation and stress...Ch. 1 - What is twinning? How does it differ from slip?Ch. 1 - Prob. 21QLPCh. 1 - What is the significance of the fact that some...Ch. 1 - Is it possible for two pieces of the same metal to...Ch. 1 - Prob. 24QLPCh. 1 - A cold-worked piece of metal has been...Ch. 1 - What materials and structures can you think of...Ch. 1 - Two parts have been made of the same material, but...Ch. 1 - Do you think it might be important to know whether...Ch. 1 - Explain why the strength of a polycrystalline...Ch. 1 - Describe the technique you would use to reduce the...Ch. 1 - What is the significance of the fact that such...Ch. 1 - Prob. 32QLPCh. 1 - It has been noted that the more a metal has been...Ch. 1 - Is it possible to cold work a metal at...Ch. 1 - Comment on your observations regarding Fig. 1.14.Ch. 1 - Is it possible for a metal to be completely...Ch. 1 - Prob. 37QTPCh. 1 - Prob. 38QTPCh. 1 - Plot the data given in Table 1.1 in terms of...Ch. 1 - A strip of metal is reduced from 30 mm in...Ch. 1 - Prob. 41QTPCh. 1 - How many grains are there on the surface of the...Ch. 1 - Prob. 43QTPCh. 1 - Prob. 44QTPCh. 1 - Prob. 45QTPCh. 1 - A technician determines that the grain size of a...Ch. 1 - If the diameter of the aluminum atom is 0.28 nm,...Ch. 1 - The following data are obtained in tension tests...Ch. 1 - Prob. 50QTPCh. 1 - Prob. 51QTPCh. 1 - Prob. 52QTPCh. 1 - Same as Prob. 1.39, but ASTM no. versus...Ch. 1 - By stretching a thin strip of polished metal, as...Ch. 1 - Draw some analogies to mechanical fiberingfor...Ch. 1 - Draw some analogies to the phenomenon of hot...Ch. 1 - Take a deck of playing cards, place a rubber band...Ch. 1 - Give examples in which anisotropy is scale...Ch. 1 - The movement of an edge dislocation was described...
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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
- During heat treatment of metals, after the recovery phase, the next two stages include the following behaviours:arrow_forwardPlease provide a detailed solution. Explanation required for the formula used.arrow_forwardFor each question, provide an explanation, identifying the correct choice ( it is marked in red) and explaining why it's the right answer, as well as why the other options are incorrect.arrow_forward
- Question 7arrow_forwardWhen a cold-worked metal is heat-treated below its melting point over a period of time, which of the following phenomena occur? (This question has more than one correct answer) a. Strength is increased b. Dislocation density decreases c. Grain size increases d. Internal lattice strains decrease e. Ductility is reducedarrow_forward4. Johnston and Gilman reported that in a grown LiF crystal that has been subjected to a constantstress of 10.8 MPa, the dislocation velocity at 249.1 K was 6×10-3 cm/s and at 227.3 K thevelocity was 10-6 cm/s. They also observed that their data suggested an Arrhenius relationshipbetween the dislocation velocity and the absolute temperature so that we can write? = ?exp ( ― ?/??)where v is the dislocation velocity, A is a constant of proportionality, Q an effective activationenergy in J/mol, and R is the universal gas constant (8.314 J/mol.K). Determine Q and A usingthe given data and the above equation. 5. A typical cross-head speed in a tensile testing machine is 0.2 in./min. (a) What is thenominal/engineering strain rate imposed by this cross-head speed on a typical engineering tensilespecimen with a 2 inch gauge length? (b) Estimate the average dislocation velocity that would be obtained at this strain rate in analpha-iron specimen with a total dislocation density of 1010 cm-2 of…arrow_forward
- Did I get these right?arrow_forwardThe ASTM grain size for a metal was 3. Determine the number of grains at a section from its surface with an area of 1 in? at magnification of 1x (life size)? Answer:arrow_forwardDuring a heat treatment, is the formation of a brand-new set of grains that are strain-free and equiaxed. These new grains have low dislocation densities and are characteristic of the pre-cold-worked condition.arrow_forward
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