(a) What effects does it have on the microstructure? (b) How does this affect dislocation movement? (c) Why/how does this affect the properties
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Define quenching. (a) What effects does it have on the microstructure? (b) How does this affect dislocation movement? (c) Why/how does this affect the properties?
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- a.) In the recrystallization stage of the single-phase metals, the recrystallization temperature increases when the purity of the metal__________ b.)What happens to the material strength when the dislocation density increases?____________ c.)In single-phase metals, as the percent cold works (%CW) increases, the recrystallization temperature_________Does strain hardening aluminium increases the strength by reducing the number of dislocations? Why ?Describe the process conditions necessary to create a)a cored microstructure and b) a non- cored microstructure.?
- Briefly describe how precipitation hardening happens in Al alloys (how the microstructure evolves as annealing time increases). Why it first forms q” then q’ before q is finally formed? How does the alloy’s strength change during this process? What are the strengthening mechanisms?Lead-Tin (Pb-Sn) alloys are used in soldering applications. Draw phase diagram and Distinguish between the micro-structure at composition of “Pb40%Sn” and “Pb80%Sn”.If a series of dislocations produced by a single FrankRead source encounter an impassible barrier, a back stress is created. What is the reason for this back stress, and why is it very effective for dislocations produced by a single F-R source?
- Calculate the approximate total dislocation line length(or range of lengths) expected in a cubic cm of a very highlycold-worked metal.1) Give a brief explanation why the solubility of C is higher in y-iron than in alpha-iron. 2) Why must the samples be quenched rapidly to obtain high hardness?Explain the differences in the grain structure between a metal which has been cold worked and another same cold worked piece but has been fully re-crystallised. Why are small angle grain boundaries not as effective in interfering with the motion of dislocation as high angle grain boundaries?
- Does the strength of a metal always increase as dislocation density increases? Explain.1- Describe, with using necessary diagrams, the structure of plain carbon steel (0.25% C). 2- explain the heat treatment and quenching process of plain carbon steel.Draw a simple sketch and explain the dislocation climb mechanism. How does temperature affect the climbing mechanism?