Assessment on Mechanical Properties of Ductile Cast Iron by Formulating Empirical Equations

In this work an attempt is made to assess the mechanical properties of SG iron by formulating empirical equations to determine the ingot diameter (solidification cooling rate) and vice versa for a given chemical composition. Five samples were produced by taking different ingot diameter to cover wide range of solidification cooling rate. The mechanical properties are noted. It was observed that, the mechanical properties such as Ultimate Tensile Strength and Yield Strength are decreasing as the ingot diameter is increasing. The % elongation is increases as the ingot diameter increases. It was also observed that the hardness value decreases as the ingot diameter increases. By using these relations an attempt is made to formulate empirical equations, which can give the desired ingot diameter (solidification cooling rate) for a given mechanical properties and vice versa. By applying these equations, the manufacturer can easily assess what should be ingot diameter to obtain the desired mechanical properties and vice versa. Hence the time required for the manufacturer to decide the manufacturing process parameters can be reduced.