Abstract
Continuously cast round blooms from vanadium microalloyed steel denoted as 25CrMo4 type are very sensitive to internal defect creation during casting. Further propagation of internal cracks is affected by suboptimal heating preceding the hot rolling process. FEM offers powerful tool for simulation of the temperature gradients and stress-strain behavior. In this paper it is demonstrated that proper selection of FEM model is essential to get trustworthy results corresponding with practical observations. It is possible to find optimum between two contradictory requirements – acceptable computation time severity and trustworthy results, if the simple model is compared with experimental data and/or more sophisticated models.
Highlights
It is generally known that niobium and vanadium microalloyed steels are very sensitive to surface and internal defect occurence after continuous casting
Within this paper studied variables were temperatures, equivalent of stress and equivalents of elastic, plastic and total strains
Temperature development during heating is across the bloom is characterized by heat gradient creation
Summary
It is generally known that niobium and vanadium microalloyed steels are very sensitive to surface and internal defect occurence after continuous casting. It was found that proper heating strategy preceding the hot rolling process is necessary to prevent excessive internal defects grow [8-10]. It is mandatory, to find proper heating conditions and calculate thermophysical properties of studied steel as well as to respect microstructure and chemical inhomogeneity of the continuosly cast bloom. FEM simulations are very perspective tools for studying the temperature gradients and stress-strain behaviour in the bloom [11-20]. We used three models to demonstrate how essential is the model definition with respect to the selection of observed parameters such are equivalent of stress, equivalent of elastic, plastic and total strain
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