抄録
Thermal conductivity, electrical resistivity, and damping capacity of ferritic cast irons at room temperature definitely decreased with the graphite shape changing from flake to compacted vermicular graphite. The effects of graphite shape on the thermal conductivity and damping capacity became smaller with elevating temperature. The damping capacity of flake graphite cast iron decreased with elevating temperature. The decrease in the damping capacity was attributable to the characteristic property of graphite. With an increase in graphite nodularity Young's modulus increased, but the rate of increase of the modulus decreased when graphite nodularity became higher than 70 %. From an analysis using iron-graphite composite models, it was suggested that the electrical resistivity and Young's modulus of cast iron were controlled by the properties and continuity of the matrix, while the thermal conductivity and the damping capacity were controlled by those of the graphite. Therefore, a fair correspondence between the electrical resistivity and Young's modulus of cast iron was observed.
