Characterization of the Internal Friction Properties of 2.25Cr-1Mo Steel

Abstract

Characterization of the internal friction properties of 2.25Cr-1Mo steel was investigated with the forced flexural oscillation by a dynamic mechanical analyzer (DMA). Over the range of variables (temperature, frequency, and vibration strain amplitude) normally encountered in service applications, the results show that the internal friction and modulus of 2.25Cr-1Mo steel at elevated temperatures were dependent not only on the temperature, but also on the frequency. Meanwhile, the internal friction was independent of strain amplitude in the present range below 2 Â 10 À4 . According to analysis of above results, it indicated that the internal friction consists of two components. Both components are due to relaxation mechanisms: the first is a thermoelastic relaxation and the second is a broad diffusion-controlled relaxation.