Only answer if you know correctly, as itsveryimportant for me, i will surely give helpful tocorrect answer and unhelpful to wronganswers3. 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 theball mill process), and (ii) melt casting. Which rod will have more strength i.e. hot press or meltcasting (explain and justify your answer)?

Macro grain : The grain size or shape is visible to an naked eye Micro grain : The grain size is…

Answered: What is/are the differences between…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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How will results vary for grain size when using the linear intercept method versus the circular grid method?
Is there any relationship between a crystal and a grain? justify your answer.
The ball of a ballpoint pen is 1 mm in diameter and has an ASTM grain size of 10. How many grains are there in the ball?
With another student in class, discuss how a deposit with a coarse grain size indicates whether it was deposited by a high- or low-energy transporting mechanism. Give several examples of various transporting mechanisms that would produce such a deposit
You 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 ?
The company has recently expanded their product range to include some aluminium components. Toaid in the manufacturing process michael has been asked by the production manager to determine theamount of heat energy required to exactly melt 40kg of aluminium at 20° C. The melting point ofaluminium is 660 °C, its latent heat of fusion is 387 kJ/kg and its specific heat capacity is 950J/kg.K.Briefly discuss the changes that occur within the copper during this process. please solve exact and accurate with complete steps and explanation..Thank you!!!!!
2. (a) Nickel-based alloys are used for gas turbine blades in aerospace engines. Briefly discuss the characteristics that make these alloys the choice for this application. (b) Single-crystal technology is applied to nickel alloys that are used as gas turbine blades in aerospace engines. With the aid of sketches describe how a single-crystal casting can be manufactured and explain why a single-crystal casting is likely to have superior creep resistance than a directly-solidified one. (c) Demonstrate the application of the Ten-percent Rule by calculating the approximate tensile strength and elastic modulus in the 0˚ direction of a carbon-fibre reinforced polymer composite if the strength and elastic modulus in the 0˚ single ply are 3620 MPa and 143 GPa respectively. The lay-up sequence of the composite is [02/+45/-45/902]s.
Do noncrystalline or amorphous materials have grain boundaries? Why or why not?
It has been found that ‘pyrex’ cookware made of borosilicate glass does not shatter during baking or cooking around 300°F. However, shattering of cookware made of soda-lime-silicate glass was frequently reported during the years 2012-2013. Find and explain the possible reasons for cookware shattering. Show your calculation. Assume that the cookwares are free of pores, cracks, and scratches.
80 kg of aluminum is to be heated to a pouring temperature of 750°C. The unit melting and pouring energy of the metal = 1035 J/g. Thermal efficiency of the furnace = 65%. How much time is required to heat the metal from 25°C to the pouring temperature if the electric induction furnace generates 100 kW? p x T = 21.23 min
4. 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…
A steel bar is heated in a furnace until it reaches 2000oF. The blacksmith observes that it cools to 1500oF in 15 minutes. It needs to be hammered into shape before it gets within 500oF of the room temperature (100oF) before it gets too cold to be shaped properly. After pulling out the steel bar from the furnace, how long does the blacksmith have before it needs to be reheated? Assume that Newton's law of cooling is applicable.

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