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A Design Study in Austempered Ductile Iron - Smith Foundry Drive Wheel

Austempered Ductile Iron (ADI) Advantages
The ADI casting requires a precisely controlled heat-treatment (heat, hold, quench, austemper, and cool) to develop the desired microstructure (acicular ferrite and carbon-stabilized austenite) and mechanical properties.

The  different grades and mechanical properties of ADI alloys are described in the ASTM A897 specification for austempered ductile iron castings.

Austempered ductile iron provides--

  • Yield strength, toughness and impact resistance comparable to many cast/forged steels.

  • Vibration dampening and heat transfer superior to other ferrous/non-ferrous alloys.

  • Significant weight and cost savings over both aluminum and steel castings/forgings.

  • Increased fracture and fatigue strength.

  • Cost savings over aluminum and steel castings/forgings.


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Copyright 2005 by the American Foundry Society. All rights reserved.
Address Comments to: jss@afsinc.org. 
Last Modified:May, 2005 by STG

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