抄録
The authors are investigating the influences of several conditions — melting and inoculating temperatures, raw materials, melting furnaces, chemical compositions and gas contents of the melt, and the kinds and additional percentages of the inoculants — on the effect of inoculation. The results obtained are as follows. (1) Superheating of the melt increases the tendency of stabilizing cementite. The inoculation of the melt superheated results in the uniform distribution of medium size flake graphite and also results in the matrix consisting of pearlite and fine ferrite. Therefore, the higher the melting temperature, the better effect of inoculation is obtained. (2) The higher the melting temperature, the more addition of inoculant is necessary for sufficient inoculation. (3) The higher the inoculating temperature, the more effective inoculation is carried out. (4) By inoculating the melt contained 0.4∼0.8 per cent phosphor, the tensile strength and transverse load are increased considerably, but the increase of transverse deflection and impact value are small. Small increase of toughness may be due to the fact that steaditeis not affected by inoculation.
