Exceptional ADI castings start with exceptional ductile iron. Urick Foundry's castings are among the industry's highest in graphite nodularity, a key factor in maximizing the austempered ductile iron properties. Applied Process, a world-class expert in metal heat treatments, recognizes this consistency and is proud to work with us as our exclusive austempering partner.
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Like other heat treatments for metals, austempering begins by heating a ductile iron part to a temperature of between ° and ° F, which loosens the molecular structure and allows for increased carbon absorption. Where it differs is the salt quench &#; immersion of the part in a bath of molten salt (between 450° F to 750° F), rather than oil or water. Because the temperature of the salt bath is held constant over a longer period of time, carbon absorption and structural consistency are improved as the part cools, resulting in a stronger near-net shape product.
The metal matrix is the primary determinant of the mechanical characteristics in ductile iron and ADI. In traditional ductile iron, a regulated blend of ferrite and pearlite makes up the matrix.
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A superior set of advantages such as low cost, design flexibility, good machinability, high strength-to-weight ratio, and good toughness, wear resistance, and fatigue strength is provided by ADI grade castings.
It offers all the production benefits of a typical Ductile Iron casting since it may be cast like any other member of the family. It is then put through the austempering process to give it mechanical qualities that are better than those of traditional ductile iron, many cast and forged steels, and cast and forged aluminum.
The distinctive acicular ferrite and Ausferrite (carbon stabilized austenite) matrix that makes up ADI essentially gives it these special qualities.
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