Metals Strengthening (2)

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Author:
Marciaho
ID:
269868
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Metals Strengthening (2)
Updated:
2014-04-09 01:07:21
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Metals Strengthening
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Metals Strengthening (2)
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Metals Strengthening (2)
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  1. Strengthening Mechanisms (4)
    • Grain size reduction
    • Solid solution strengthening
    • Precipitate Strengthening 
    • Cold work /strain hardening
  2. Annealing (heat treatment) Effects on deformation and strength (3)
    • Recovery 
    • Recrystallization
    • Grain Growth
  3. Solid solutions (a) stress field
    Impurity atoms ____ the lattice and generate ____
    _____ can produce a _____ to dislocation motion
    • Impurity atoms distort the lattice and generate stress
    • Stress can produce a barrier to dislocation motion
    • Think of a dislocation gliding into vicinity of solute atom
  4. Solid solutions (b) solute drag
    ____ impurities tend to _____ at dislocations
    Reduce ____ of dislocation there increases ____
    • Small impurities tend to concentrate at dislocations
    • Reduce mobility of dislocation there for increase strenth
  5. Cold work dislocations
    Dislocations _______with on another during cold work
    ________ becomes more difficult
    • Dislocations entangle with on another during cold work
    • Dislocation motion becomes more difficult
  6. Dislocation density equation
    Total dislocation length / unit volume
  7. As cold work is increased: 
    Yield strength _______ 
    Tensile strength ________ 
    Ductility ________
    • Increases
    • Increases
    • Decreases
  8. What is the tensile strength and ductiliy after cold working? 
    %CW equation
    Pi*r0^2  - Pi ra^2/ (Pi *r0^2) x 100
  9. Stage 1 of annealing :recovery 
    _____ T treatments - Dislocation density ____ 
    Mechanism : Annnihilation _____ dislocation desntiy
    • Low
    • Decrease
    • reduce
  10. Recrystallisation
    • Occurs at higher temperature than recovery
    • New grains are formed that have lower dislocation density
    • are generally smaller
    • consume cold work grains
  11. Grain growth
    _____ temperatures and _____ time than recrystallisaion
    Larger grains consume smaller grains

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