The first economical reason to use ADIs is that the base material (nodular iron) is cheaper than steel, the second is that ADIs are casting materials, thus products can be molded, allowing significant cost reduction of the manufacturing process when compared to conventional steel machining. Replacing conventional steel parts by ADIs results in several advantages which strongly promoted the acceptance and use of these materials, namely in the automotive industry. Actually, some ADIs are only surpassed by high-resistance alloyed steels when tensile strength is considered. Among the Fe?CC alloys products, ADI presents a very interesting combination of mechanical properties. ![]() Therefore, ADI has become an attractive and economic substitute for forged steel and cast steel in many engineering applications.Īustempered ductile iron (ADI) has been used since the late 1970s and significant developments have been made since then, being now possible to produce high-resistance ADIs. In addition to the exceptional wear resistance and fatigue strength, it enables designers to reduce a component's weight and costs for equivalent or improved performance. Austempered ductile iron is almost twice as strong as the regular ASTM grades of ductile iron, whilst still retaining high elongation and toughness characteristics. It exhibits an excellent combination of high strength, ductility, toughness, fatigue strength, and exceptional wear resistance that is unavailable in other grades of cast iron. ![]() Austempered ductile iron (ADI) is a group of ductile irons offering the design engineers remarkable mechanical properties.
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