Study of Carbon Steel by Mechanical Spectroscopy
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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