casting class

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casting class

  1. 1. Solidification of the metal Metal alloy Pure metal Pouring temperature Temperature Pouring temperature Freezing ends Freezing ends Freezing begins Freezing begins Time Time •Local solidification time •Total solidification time
  2. 2. Alloy formation: by solid solution • Solvent atom (Fe) • Solute atom (c) Substitutional solid solution Ex: Brass: Cu(Zn) Alloy: steel Interstitial solid solution Ex: Steel Fe (C)
  3. 3. Intermetallic Compound • No of atoms of constituent-elements are in specific ratio. • Some intermetallic compounds have solid solubility • They are strong hard and brittle. • Bond: metallic or ionic • Example: CuAl2 (precipitation hardening)
  4. 4. Two-phase alloys Phase: Two-phase system: • First phase is a solid solution Second phase particle disparsement Ex: Cu-Pb • OR may have two sets of grains
  5. 5. Phase diagrams Lever rule: to calculate the wt. fraction of solid and liquid phase
  6. 6. Pb-Sn binary phase diagram
  7. 7. Fe-C system
  8. 8. Cast structure of pure metal
  9. 9. Open and Closed Mould
  10. 10. Sand Casting (Expandable-mould, Permanentpattern Casting)
  11. 11. Use of chaplets to avoid shifting of cores Possible chaplet design and casting with core
  12. 12. Use of chills

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