In this paper a systematic study has been undertaken to correlate the microstructural variation with acoustic emission parameters during tensile deformation of 2.25Cr-1Mo steel. Tensile testing of normalised and thermally aged samples has been carried out at a strain rate of 6.66 x 10(-4) s(-1) with simultaneous monitoring of acoustic emission (AE) parameters. Results have shown that acoustic emission activities are higher for normalised condition and the same decreased with the severity of thermal aging. Higher acoustic emission activities in normalised condition have been attributed to the presence of fine coherent M3C and Mo2C precipitates, which strengthen the matrix as a result of precipitation hardening. The reduction in acoustic emission activities in thermally aged condition has been found to be due to spheroidisation and coarsening of carbide precipitates which result in an increase in inter particle spacing.
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