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casting class
casting class
casting class
casting class
casting class
casting class
casting class
casting class
casting class
casting class
casting class
casting class
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casting class

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Transcript

  • 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. 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. 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. 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. Phase diagrams Lever rule: to calculate the wt. fraction of solid and liquid phase
  • 6. Pb-Sn binary phase diagram
  • 7. Fe-C system
  • 8. Cast structure of pure metal
  • 9. Open and Closed Mould
  • 10. Sand Casting (Expandable-mould, Permanentpattern Casting)
  • 11. Use of chaplets to avoid shifting of cores Possible chaplet design and casting with core
  • 12. Use of chills

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