A fracture mechanics study of flake graphite cast iron

In the present investigation, flake graphite cast iron fracture toughness w ith different matrixes and eutectic cell sizes is studied. Properties of te nsile strength, hardness and impact toughness are also studied. The experim ental data are compared to the same determined parameters in silicon steel with a chemical composition similar to that of the cast iron etallic matrix . A subsequent study of the crack surfaces enables us to establish fracture mechanisms. The joint analysis of the mechanical results and of the fracto graphic studies allows to establish the influence of graphite on the differ ent mechanical properties of cast iron and on fracture micromechanisms as w ell. Models of fracture mechanics which evaluate tensile strength and fract ure toughness are examined making contributions that may improve such model s.