ANNEALING

ANNEALING - ColdWorkandAnnealing Chapter7 StrainHardening

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    Cold Work and Annealing Chapter 7
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Strain Hardening When a piece of metal is deformed, the  dislocations run into each other This traffic jam increases the material’s  strength Deforming a piece of metal also actually  increases the number of dislocations This increases the strength too!!
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Tensile Test You can understand this better by  relating it to the results of the tensile  test.
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Try it!! Strain harden a piece of copper tubing.
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Effects of Strain Hardening Yield Strength goes up Tensile Strength goes up Ductility goes down The material becomes brittle
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Strain Hardening Coefficient Strain Hardening Coefficient is a  measure of how much the metal can be  strengthened by strain hardening It needs to have some ductility to be  strain hardened.
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Effect of Crystal Structure HCP metals are already brittle Little strain hardening is possible Strain hardening coefficient around 0.05 BCC metals are less brittle than HCP Some strain hardening is possible N around 0.15 FCC metals are ductile Strain hardening is easy N around 0.5
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Strain Hardening in Polymers When you pull on a polymer, the chains  line up Van der Waal bonds form between the  chains The polymer becomes stronger Try it with a 6-pack ring!!
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This note was uploaded on 01/22/2012 for the course ME 2733 taught by Professor Meng during the Fall '10 term at LSU.

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ANNEALING - ColdWorkandAnnealing Chapter7 StrainHardening

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