High Temperature Behavior during Solidification of Peritectic Steels under Continuous Casting Conditions

摘要

The high temperature behavior of solidifying steel is of great importance for the continuous casting process. In the process, the shrinkage of the solidifying steel plays an important role, because it affects the surface and internal quality of the cast product. The calculation of shrinkage using mathematical models is strongly influenced by the material data and the constitutive equations, which are not very well known at temperatures close to the solidus. The influence of the carbon content on the solidification and shrinkage is investigated using a modified hot tensile test, which allows the measurement of the contraction force during solidification. In addition, a thermo-mechanical model of the test is developed, based on an elasto-plastic approach and considering hardening and softening mechanisms due to the high temperature deformation process. The modeling results are in excellent agreement with the experimental results and provide a better understanding of the phenomena occurring during the shrinkage of steel.