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A Design Study in Metal Matrix Composite Castings - AAAV Transmission Case                                           

Casting Flow and Wall Fill

When gravity casting SiC-aluminum MMC alloys, the foundry engineer cannot rely on excess superheat or high metal velocity to fill thin walls and extended features.
  • Excess superheat will result in aluminum carbide formation in the melt which will reduce mechanical properties.
  • High metal velocities result in high levels of casting defects.

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The casting  engineer should review the casting design for thin wall sections and long runs and consider where and how to thicken  critical wall features to eliminate misruns.





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Last Modified:August, 2001 by STG

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