Abstract
To improve the quality of welded joints of high-strength high-carbon railway rails, induction heat treatment is used. While optimizing the technological process of induction heat treatment, mathematical simulation based on numerical calculation methods was used. It allowed a significant simplification in determination of optimal process parameters. Based on the theory of similarity, a scaled down model sample with a welded joint made of rail steel K76F was considered. During heating and cooling of the sample, the necessary distribution of the temperature field in the welded joint area was provided. By calculating the thermal field and heating rate, holding the set temperature and cooling, structural transformations in the welded joint area of the sample were calculated and the structure of a heat-treated metal was determined. After that, physical simulation of the heat treatment of the model sample was performed and the calculated and experimental characteristics of the heating process were compared. The characteristics almost coincided.
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