Digital Simulation of Physical Fields during Induction Hardening of Bulky Products

The article presents an analysis of the mathematical models of physical fields in induction heating systems designed for the heat treatment of large-diameter rolling mill rolls. Digital models have been developed that effectively describe induction heat treatment processes, accounting for the complex interconnection between electromagnetic and thermal fields in cylindrical systems. Models describing the microstructural transformations and thermal stresses arising during the heating and cooling of the rolls have also been developed. The results obtained open the possibility to assess the roll material's microstructure, hardness, grain size, and residual stresses. These models help optimize the equipment design and heat treatment parameters, thereby improving the hardening quality and reducing the energy consumption. The dual-frequency hardening technology for rolling mill rolls is examined as a case study.