Metal Casting

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Metal Casting

• By Tanner Powell

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Overview of Casting

• Net or near net
• One of the most utilized production methods
• Many different types of casting named for mold
  types

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The Function of Casting

• To control the size, shape, composition, and
  crystalline arrangement of metal products in
  order to achieve the desired functionality.

Iron, carbon, tungsten, vanadium, cobalt,
chromium, sulfur alloy know as a Micro-Melt
Maxamet Alloy
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Temperature Control

• Casting methods include ways to heat and cool
  specific areas of the mold at different rates.
• Purpose of temperature control is to regulate
  filling and cooling rates.
• A number of casting defects are caused by fast
  cooling rates
• Grain size is also related
• to cooling rate. Faster
• rates yield larger grain sizes.
• Larger grain sizes usually
• result in lower densities.

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Heat Treatments

• Different methods of hardening can be implemented
  to exploit the effects of cooling rate on grain
  structure.
• Annealing is one most common method where a metal
  piece is heated to crystallization temperature.
  At which time crystal structures are allowed to
  reorient themselves. Depending on the cooling
  rate, the crystals may form any number of
  arrangements and sizes.
• Grain structure has very noticeable effects many
  different properties of the final product.
• Not only harness, ductility, and density, but
  also conductivity, magnetism and reactivity are
  effected.

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References

• Second Page Image http//crswnew.cartech.com/wnew/
  techarticles/TA00029.html
• Third Page Image http//www.hoben.co.uk/
  industrialcasting/
• Annealing of Casting http//www.key-to-steel.com/
  Articles/Art16.htm
• Last figure http//www.msm.cam.ac.uk/Teaching/
  mat1b/courseA/lecture3-5.pdf