THERMAL HISTORY CALCULATIONS FOR CONTINUOUS CASTING OF METALLIC GLASS TAPES

Abstract

Publisher Summary This chapter discusses the thermal history calculations for continuous casting of metallic glass tapes. The production of metallic glass tapes of optimal quality requires a detailed understanding of the production process. On the basis of the empirical and semi-empirical relations found between the technological conditions and the tape dimensions, the geometry of the product can acceptably be predicted. On the other hand, homogeneity and physical properties are determined by the thermal history (TH) encountered during the preparation, which depends on the casting conditions and the mechanism of tape formation. On the basis of laminar boundary layer theory (LBLT), the chapter discusses how melt flow influences the cooling process and then explores the use of infinite viscosity approximation (IVA) in thermal history calculations. The chapter also discusses the consequences of the sudden section thickness change at the end of the melt pool and those of the nonideal heat contact between the alloy and the substrate in the frame of IVA. On the basis of the boundary layer theory, it is expected that calculations with infinite melt viscosity can reliably determine the thermal history in the temperature region.