The Paton Welding Journal, 2021, №09



2021 №09 (04)

DOI of Article 10.37434/tpwj2021.09.05

2021 №09 (06)

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The Paton Welding Journal, 2021, #9, 27-38 pages

Modeling of the process of induction heat treatment of welded joints from rail high-strength steels

R.S. Hubatyuk, S.V. Rymar, O.S. Prokofiev, V.A. Kostin, O.V. Didkovskyi and E.V. Antipin

E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

Abstract
The selection of technological parameters of the heat treatment process, which provides the necessary structural and phase transformations of rail welded joint, is a very expensive process that requires a large number of experiments with a significant consumption of power, time, labor and financial resources. The paper proposes the method of mathematical and physical modeling of thermal processes to determine the optimal parameters of heat treatment of rail welded joint on model specimens based on the theory of similarity, taking into account the interrelated properties and physical phenomena with the original study. The solutions obtained during realization of this method provide a considerable reduction of resources at determination of optimum modes of heating of products from high-strength carbon steels, in particular, rails. Based on the scale factors of criteria of electromagnetic and thermal similarity, a mathematical model of the induction system for numerical calculation of propagation of electromagnetic and thermal fields was developed. The finite element method was used, which represents a tool for combining integral characteristics with the values of vector characteristics of the studied electromagnetic fields. The dependence of physical properties of materials on temperature was taken into account. In the course of parametric study, the parameters and configuration of the «inductor– product» system were determined and the space-time distribution of the temperature field during heat treatment modeling was determined. The obtained data of numerical calculation should be used during physical modeling of optimization of the modes of heat treatment of the sample and will significantly reduce the number of experiments to determine the effect of thermal heating on phase transformations and mechanical properties of steel in the zone of welded joint. 18 Ref., 2 Tables, 9 Figures.
Keywords: induction heating, heat treatment, welded joint of railway rails, mathematical modeling, similarity theory

Received 12.07.2021

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