Abstract
Internal friction measurements are commonly used to quantify solute carbon in body-centered iron via the Snoek relaxation effect. For low-carbon steels, the height of the Snoek peak is proportional to the carbon content in solid solution. Our simulations show that highly carbon-supersaturated ferrite violates this linear relationship and exhibits a giant Snoek peak around a specific temperature-dependent carbon content. This effect is related to the carbon-carbon strain interaction, also responsible for the Zener order-disorder transition. We provide analytic formulae allowing the quantitative analysis of experimental results of mechanical spectroscopy on supersaturated ferrite. Our conclusions rely on Monte Carlo simulations carried out at the atomic scale and on the mean-field elastochemical model, using no adjustable parameter.
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