in hypereutectic nodular cast irons primary precipitation of graphite may lead to graphite flotation in thick section castings. graphite degeneracy such as so-called exploded graphite is then often associated with this flotation phenomenon and it appears as precipitates where the nodular form is replaced by star-like or flower-like shape. it has been reported that exploded graphite develops
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next month: the influence of carbon flotation on mechanical properties and the control and assessment of flotation. references a. g. fuller t. n. blackman " effects of composition and foundry variables on graphite flotation in hypereutectic ductile irons" afs transactions vol 94 pp 823-862 (1986). t. n.
ductile iron foundry which truthfully claims not to have shrinkage concerns is the exception to the rule. other common defects may be divided into two basic categories:-those related to nodule shape and size such as compacted graphite structures exploded and chunky graphite graphite floatation spiky graphite and nodule alignment.
the most important and distinguishing microstructural feature of all ductile irons is the presence of graphite nodules which act as "crack-arresters" and give ductile iron ductility and toughness superior to all other cast irons and equal to many cast and forged steels.
nodular ci is part of the group of irons called ductile iron it's not so much a special formula but controlling the microstructure "as cast" it can be accomplished through heat treating but is easier through the addition of nodulizing elements. read page 2 of the is a vintage lodge cast iron skillet better than a new one discussion from
ductile iron is a type of cast iron with nodular graphite inclusions that is less brittle than most cast irons. it was invented by keith millis in 1943.