Sensitivity Analysis of a Thermo Mechanical Process Model for Shell Formation in Continuous Casting

ABSTRACT: The strand shell formation in the continuous casting mould and the early stages of secondary cooling is critical for the process reliability and the overall process performance as well as the quality of the near surface part of the strand. Reliable process models with significant extrapolation capabilities are still under development. This paper attempts to identify the set of process parameters of highest relevance and demonstrates the sensitivity analysis of continuous casting process models. Due to the fact that the heat fluxes and shrinkages in the plane perpendicular to the casting direction are dominant, a 2-D process model for the strand shell formation is a good starting point. It includes thermal shrinkage data from the TCFE6 database, the modelling of a self consistent gap and the resulting heat transfer to the mould surface. After some validation against experimental data on mould heat flux, a sensitivity analysis of this model provides quantitative information about the effect of the controllable process parameters on the strand shell properties related to the overall process productivity and safety. These sensitivity results from an ABAQUS/THERMOCALC based process model for billet and slab casting are critically discussed, especially with respect to the practical relevance. The importance of plant data (e.g. from mould instrumentation and break out shells) for model parameter identification is highlighted. Finally the role of the interface heat transfer coefficient (IHTC) in model development and corresponding laboratory experiments are discussed with respect to model validation and practical application

Grundlagenuntersuchungen der Eigenschaften thermisch emittierender Katoden fuer Gasentladungen. Teilvorhaben: Selbstkonsistente Modellierung des katodennahen Plasmas Schlussbericht

SIGLEAvailable from TIB Hannover: F01B217+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman