Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 1, Problem 46QTP
A technician determines that the grain size of a certain etched specimen is 8. Upon further checking, it is found that the magnification used was 125 x, instead of the 100 x that is required by the ASTM standards. Determine the correct grain size.
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If a rod of single-crystal copper (FCC) is pulled in tension in the [210] direction (i.e. force direction) at a tensile stress of 50 MPa, slip will occur in the [0 1 1] direction on the (1 1 -1) plane. Use this information to answer the following questions.
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1.
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Chapter 1 Solutions
Manufacturing Engineering & Technology
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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- The fine grains have lower toughness than coarse grains. Select one: True Falsearrow_forwardFrom the grain distribution curve, D60 = 1.45 mm, D30 = 0.75 mm and D10 = 0.45 mm. Determine the coefficient of gradation.arrow_forwardQ2. Using the intercept method, determine the average grain size, in millimeters, of the specimen whose microstructure is shown in Figure c use at least seven straight- line segments. Assume the length of each segment is 80 mm, consider the magnification is 300 X. 6 Q3. Use the ASTM method to find the grain size for figure d, consider the magnification is 200X. darrow_forward
- Under which of the conditions below is the generalized Hooke’s law applicable for use in analysis? a. When the material distorts due to any of the normal stresses b. When the material has a negative value for Poisson’s ratio c. When the material exceeds its proportional limit but still remains elastic d. When the material’s cross-section changes along one direction Which of the following statements is false about the Poisson’s ratio? a. It is a dimensionless quantity b. It relates the modulus of elasticity E and the modulus of rigidity G c. It has a single value for isotropic and homogeneous materials d. Its magnitude is equal to the negative ratio of the longitudinal strain to the lateral strain.arrow_forwardGrain size does not have a major influence on mechanical properties true or falsearrow_forward2.) Two previously undeformed specimens of the same metal are to be plastically deformed by reducing their cross-sectional areas. One has a circular cross section, and the other is rectangular; during deformation the circular cross section is to remain circular, and the rectangular is to remain as such. Their original and deformed dimensions are as follows: Circular Rectangular (diameter, mm) (тm) Original dimensions Deformed dimensions 18.0 20 x 50 15.9 13.7 × 55.1 Which of these specimens will be the hardest after the plastic deformation? a) The deformed circular specimen will be harder b) The deformed rectangular specimen will be harder c) Both will have the same hardness d) Both would brake e) No estimation can be made for such processarrow_forward
- 3 l Two tensile samples were cut from a titanium ingot that was cooled very slowly, and under specific conditions so that the ingot was a single crystal. The samples were then put in a tensile tester to determine their 0.2% offset σys. The σys for the two samples resulted in one sample having a value that was twice of the other. What could the cause be?arrow_forwardGrain size does not have a major influence on mechanical properties. True False Identify the crystal in the picture.arrow_forwardSine bar is employed for the precise angle measurement along with slip gauge and dial test indicator in a workshop. At the end of the measuring process, the angle of the specimen found to be 390 for the slip gauge setting ( h ) of 46.12 mm for zero deflection of dial test indicator. Find the length of the sine bar using the above-mentioned data.(b) Using the following observation and find the actual size of the specimen in mm. LC=0.02 mm.arrow_forward
- QUESTION 8 A small component is made from aluminium 7475 where Kc = 35.2 MPa m 1/2 Non-destructive testing by micro-computed tomography showed the component to contain cracks of up to 2a = 0.05 mm in length. Laboratory tests showed the crack growth rate under cyclic loading is given by: Where A= 1.10x10-13 Assuming that: da dN = ΑΔΚΑ (MN m-2)-4 m-1 and the component is subjected to an alternating stress of range A = 180 MPa about a mean tensile stress of 40/2. ΔΚ = Δονπα Calculate the number of cycles to failure, give your answer in number of 1000s of cycles to 3 significant figures (e.g. 101,000 cycles would be inputted as 101)arrow_forwardDetermine the indentation diameter and the surface area of indentation of a copper material subjected to a Brinell hardness test with a test force of 7.1 kN using a hardened steel ball indentor of 9 mm. Take the Brinell Hardness Number as 955.arrow_forwardDetermine the ASTM grain size number of a metal specimen if 25 grains per square inch are measured at a magnification of 100x Solution please. Thankyouarrow_forward
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