Mechanical and Structural Properties of Ductile Cast Iron

Ductile cast iron round bars were prepared using alloys with carbon
equivalent percentage (C.E) ranging between 4.50 % and 4.76 %. Different
measurements were carried out on as – cast and heat-treated specimens.
Ductile cast iron is essentially a family of materials with a wide verity of
properties which are satisfactory for different engineering requirements. The
soft ferrite grades are available to use when toughness and ductility are needed,
while the harder pearlitic grades are used when higher strength is required.
Grades with mixture of pearlite and ferrite in the matrix are also available. In
addition heat treatments of the previous types present different and better
combination of properties for application with special requirements [1]. Ductile
cast iron behaves elastically over a considerable stress range in both tension
and compression. Previous works [1, 2] on ductile cast iron showed that the
main factors affecting the mechanical properties are metallurgical structures.
Results revealed that mechanical properties decrease with increasing size of
casting module. Annealing reduces mechanical properties and hardness.
Ultrasonic velocity and attenuation coefficient increase with increasing of
carbon equivalent percentage and decreased with increasing size of casting
module.