Thermal diffusivity measurement of 2.25Cr–1Mo steel with internal friction

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In this work, the internal friction of 2.25Cr–1Mo steel measured on a dynamic mechanical analyzer (DMA) was used to evaluate its thermal diffusivity at elevated temperatures. With the dual cantilever clamp, the internal friction of 2.25Cr–1Mo steel at high temperatures was obtained, which was mainly composed of the thermoelastic relaxation with a peak of 15 Hz and the broad spectrum of relaxation processes especially at low frequencies. According to the deconvolution of these results, the thermoelastic internal friction of 2.25Cr–1Mo steel at high temperatures was achieved. Then, the thermal diffusivity of 2.25Cr–1Mo steel at high temperatures was quantitatively estimated, which confirmed the validity of present method.