Abstract
Based on the previously developed model of thermal, electromagnetic, and structural-phase processes in surface layers of carbon steels under the action of high-frequency pulses, the heat release in these layers in the range of allowable field frequencies from 66 kHz to 40.12 MHz is studied. The specific energy flux of the electromagnetic field is considered as the basic energy parameter characterizing the intensity of high-frequency treatment. Frequency dependences of the dynamics of steel heating up to the liquidus point for treatment regimes important for practice with 〈W〉 = 108 and 2 · 108 W/m2 for the width of the pulse-action zone on the steel surface equal to 1.5 and 4 mm are obtained. The data of numerical calculations are used to construct the specific flux of energy as a function of the maximum surface temperature; together with the results of numerical simulations of structural-phase transformations in the steel grain, these dependences allow one to choose the optimal hardening modes at different frequencies.
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