Abstract
The article discusses the modeling of induction surface hardening technology of low-alloy carbon steels with a carbon content of 0.2 to 0. 8 %. To optimize technological parameters, such as heating power and time, current frequency and quenching depth, experimental data were generalized: dependences of austenization and homogenization temperatures heated steel on the heating rate, carbon content and grain size of the initial structure. Also, on the basis of experimental data, the dependences of austenite grain growth on the heating rate and temperature are obtained. A nonlinear coupled electrothermal numerical model was used in the work, in which the calculation of the nonlinear ferromagnetic problem was carried out in the time domain. To study the effect of phase transformations during induction heating on the choice of the optimal heating mode, an iterative algorithm was developed that controls the numerical electrothermal model. The article compares the results of simulation of induction surface hardening modes for cylindrical bodies made of St35 and St45 steels, and also provides the required surface heating temperature. The influence of the initial structure on the choice of heating mode is shown. In addition, the developed model makes it possible to predict the ultimate hardness on the surface of the hardened part for optimal cooling mode.
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