Research and Reports on Metals is an Open Access, peer reviewed material science Journal dedicated to publish high quality articles covering wide range study areas of Metallurgy Research.

A new aspect of carbon precipitates in steel is disclosed by mechanical spectroscopy. The method was applied to the study of carbide precipitation in quench-aged Fe-C alloys, mild steel, and pearlitic steel. Measurements carried out at constant temperature below room temperature (RT) down to -55°C have revealed a new broad beak (NBP) different from neither the Snoek nor the SnoekKöster peaks. This peak is characterized by the Debye peak with a distribution in relaxation time.

A mechanical spectrometer combined with the Peltier modules was applied to the study of carbide precipitation in quench-aged Fe-C alloys, mild steel, and pearlitic steel. By measuring mechanical loss spectra below RT, a new broad peak (NBP) is revealed. This peak is related to thermal activation and its line shape obeys the equation of the Debye peak with a distribution in relaxation time.

Thus, mechanical spectroscopy is powerful in disclosing unknowns in carbon steel. The directions for future studies are suggested, which include the precise determination of Fe-C phase diagram with respect to ε-carbide, research on the precipitation hardening in steel and extension of measuring window of mechanical spectroscopy for the sake of practical application of the method.

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