Ductile iron

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Microscopic image (magnification 100 ×) of etched spheroidal iron

Ductile iron - an iron alloy with carbon from the group of cast irons, created as a result of solidification of the molten charge with carbon-shaped releases similar in shape to the sphere. It has been known since 1949. It is obtained as a result of spheroidizing and then modifying the liquid alloy with low sulfur content, which without gray additives would give gray cast iron. As the spheroidizers, cerium or iron-silicon-magnesium alloy is used, while ferrosilicon is used for modification. As a result of this treatment, graphite occurs in these cast irons in a spherical form. These aggregations may occur in a perlite, ferrite or mixed ferritic-pearlite matrix. It has good strength and sliding properties. It can be deformed without damage, it is resistant to compression and bending and to high pressures. It was used for the manufacture of crankshafts, piston rings, bearings, gears, machine tool elements, agricultural machines, hydraulic machines, water turbines and others. Bibliography

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