Which statements are correct about spheroidal graphite ductile cast iron?

Question

Accepted Answer

Spheroidal graphite is formed from the molten state by the addition of modifiers

Accepted Answer

It is stronger and more ductile compared to flake and nest graphite cast iron (considering the effect of graphite shape on mechanical properties)

Answer

Spheroidal graphite is obtained from the solid state by annealing

Answer

The microstructure of the spheroidal graphite iron may contain ledeburite and cementite

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