In situ measurement of Young’s modulus of FeO scale formed on pure iron at 973–1273 K by acoustic resonance method

The Young’s modulus of FeO scales formed on a pure iron bar was measured at temperatures between 973 and 1273 K. The FeO was formed with charging 4.2 × 10⁻⁴ mol of oxygen gas five times into a reaction chamber. During the growth of FeO, a sinusoidal vibration signal was applied to the bar. The vibration force and the acceleration of the oxidised iron bar were measured in situ in order to obtain resonance frequencies. The Young’s modulus of FeO, as estimated at oxidation temperatures of 973, 1173, and 1273 K, was 98.6, 75.9, and 83.4 GPa, respectively.