Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Textbook Question
Chapter 1, Problem 42QTP
How many grains are there on the surface of the head of a pin? Assume that the head of a pin is spherical with a 1-mm diameter and has an ASTM grain size of 12.
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3. What is/are the differences between Macro and Micro grains? What is the importance of micro-
grain in nanoscience and technology? An engineer prepared two steel rods by two different methods
:(i) Ball milled the steel for 72hrs and hot press the obtained granules (obtained powder from the
ball mill process), and (ii) melt casting. Which rod will have more strength i.e. hot press or melt
casting (explain and justify your answer)?
Assume that 16 grains per square inch are counted in a micrograph taken at 250X.What is the ASTM number for grain size?
The 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:
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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- Previous solution wasn't clear ,Can you please tell me how did you got Exactly 110minutes? (Not sure whether it's Right or not)arrow_forwardThe effect of temperature on the crystallization of a material is given below. Calculate the transformation rate (min-1) at 130°C . Round your result to 2 decimal place.arrow_forwardIn an measurement with 100× magnification factor on metal specimen, 65 grains per square inch are observed. Determine the ASTM grain size number of the specimen.arrow_forward
- 4.48 Determine the ASTM grain-size number if 30 grains per square inch are measured at a mag- nification of 250X.arrow_forwardSolve it pls.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
- Briefly explain the ASTM grain-size standardarrow_forwardYou work as an engineer in a glass manufacturing plant. During that day's shift, you noticed that the defect in melting glass (Fig.1). What could be the reason for this ? (give three reasons). Which precations would you take to solve this problem ? Please write down three precations, and explain in detail ?arrow_forwardPlease provide a detailed solution. Explanation required for the formula used.arrow_forward
- For an ASTM grain size of 6, approximately how many grains would there be per square inch under each of the following conditions? (i) At a magnification of 100X (ii) Without any magnificationarrow_forwardThe diagram below shows a microscopic metal rod with a single crystal structure whose orientation is indicated by the inset. A force of F = 15.7 N is applied to the rod. The cross-sectional area is 1.3 mm2. Calculate the shear stress along the close-packed direction.arrow_forward9. Consider a metal rod, whose grain size can be adjusted by different processing techniques. The graph below shows how the yield stress changes with grain size d; the x-axis is logarithmic. The curve reaches a limiting value of 60 MPa as indicated by the horizontal dashed line on the y-axis, for very large grain sizes. Also, you are given the information that at d = 25 microns (vertical dashed line), the yield stress is 100 MPa. Using this information, what will be the yield stress at d = 5 microns? Select the closest numerical value. Use the Hall-Petch relation in working out your answer. Yield stress (MPa) ● ● 228882S 130 120 110 100 60 10⁰ 10¹ 10² Grain size d (microns) 132.4 MPa 149.4 MPa 165.2 MPa 156.3 MPa 10arrow_forward
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