Material Group - Ductile Cast Iron
Ductile iron is not a single material but is part of a group of materials which can be produced to have a wide range of properties through control of the microstructure.
The common defining characteristic of this group of materials is the shape (morphology) of the graphite.
In ductile irons, the graphite is in the form of nodules rather than flakes (as in grey iron), thus inhibiting the creation of cracks and providing the enhanced ductility that gives the alloy its name. The formation of nodules is achieved by addition of nodulizing elements, most commonly Magnesium (note Magnesium boils at 1100C and Iron melts at 1500C) and, less often now, Cerium (usually in the form of Mischmetal). Tellurium has also been used. Yttrium, often a component of Mischmetal, has also been studied as a possible
Ductile iron is specifically useful in many automotive components, where strength needs surpass that of aluminum but do not necessarily require steel. Other major industrial applications include off-highway diesel trucks, Class 8 trucks, agricultural tractors, and oil well pumps nodulizer
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