ON THE CHARACTERISTICS OF ELASTICITY OF OXIDES SCALE ON STEEL AND SPHEROIDAL GRAPHITE IRON AT ELEVATED TEMPERATURES.

Young's moduli of oxides scale of steel at elevated temperatures were measured by the method of longitudinal vibration. The values obtained in the experiment agreed well with the results of Bruce who had used the method of transverse vibration. The frequency change due to oxidation in the transverse vibration method was less stable than that of the longitudinal one and, consequently, more stable results were easily obtained by this method. The Young's moduli of the oxides scale of ferrite spheroidal graphite iron showed values about 20% smaller than those of steel. The reason for this can be considered to be due to the existence of an appreciable amount of complex oxides, FeO multiplied by (times) SiO//2, in the oxides scale.