Designing with Austempered Ductile Iron


John Keough, Kathy Hayrynen, Applied Process Inc., Greger Pioszak, Univ. of Michigan


Table 1. Mechanical Properties of Typical ADI Grades


Grade Tensile Strength Yield Strength Elongation MPa (Ksi)


400-18


(60-40-18) 450-12


(65-45-12) 550-6


(80-55-06) 700-3


(100-70-03) 800-2


(120-90-02)


414 (60)


448 (65)


552 (80)


689


(100) 827


(120)


MPa MPa(Ksi) 276


(40) 310


(45) 379


(55) 483


(70) 621


(90) Austempered ductile iron (ADI) is ductile iron that


has been austenitized, quenched and tempered for increased strength, ductility, wear resistance, design flexibility and low manufacturing cost. The material’s high strength-to-weight ratio allows it to replace alu- minum at equal weight in some applications. Its bending and con- tact fatigue strength can make it superior to aluminum and competi- tive with steel at equal hardness. ADI can offer a 65% reduction in cost when converting from a steel weldment and a lead time reduction from six to three weeks.


Designing Aluminum Casting Success—3 to 1, Good Odds for a Value Solution


American Foundry Society Marketing Division


Communicate with your metal


casting supplier prior to designing your part. Superior Aluminum Castings Inc., Independence, Mo., was producing three parts for a customer making high tech measuring equipment. The engineer on the customer side had delivered the specifications to the metalcaster without discussing the best way to design the part for met- alcasting. Only after a period pro- ducing the parts at great expense to the end-user did the group come to- gether and discuss ways to improve


May/June 2010 Metal Casting Design anD PurChasing 47


By communicating with the metalcaster, the design engineer was able to consolidate three parts into one.


(%) 18


12 6 3 2


them. In the end, the metalcaster was able to consoli- date the three-piece assembly into one piece and save the customer 50% of its total costs on the part.


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