Thermo Mechanical Modeling of Continuously Cast Stainless Steel

Abstract

The surface and internal quality of continuous casting products are strongly influenced by the behavior of the slab during solidification within the continuous casting machine. Solidification was modeled using a 2D heat transfer model with the finite volume method, employing the SIMPLER algorithm. A slab slice was defined perpendicular to the casting axis, with the following boundary conditions: symmetry along the principal axes (double symmetry), unilateral contact with friction along the machine surface, and an imposed machine temperature. These conditions help in understanding and explaining specific surface defects in stainless steel. Building on the solidification results, a 3D model was developed using the commercial finite element analysis code, Ansys, to investigate local defects in continuous casting, such as roller blocking or misalignment. Ferrostatic pressure is also considered in this analysis. The objective of this study is to develop a thermomechanical model that determines the distribution of the temperature field and the solidified fraction, and to assess the impact of certain defects on the risk of transverse cracking during bending and unbending operations. This comprehensive approach integrates both thermal and mechanical aspects, providing valuable insights into slab behavior during casting and subsequent processing. By simulating various defect conditions, the model aims to enhance understanding and control of the continuous casting process, ultimately improving product quality and reducing defects. Through advanced simulation techniques and careful consideration of boundary conditions and material properties, this study contributes to the optimization of continuous casting processes for stainless steel production.