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Convection Heat and Mass Transfer in Alloy Solidification

1996; Elsevier BV; Linguagem: Inglês

10.1016/s0065-2717(08)70142-4

0065-2717

P. J. Prescott, F. P. Incropera,

Metallurgical Processes and Thermodynamics

This chapter reviews that internal convection strongly influences alloy-solidification processes. Local cooling and solidification rates are affected by convection conditions, which, in turn, have a strong influence on the microstructural features of a casting. Moreover, advective transport of interdendritic liquid is responsible for macrosegregation. To improve solid/liquid-phase-change processes involving multicomponent materials, it is vital that engineers understand the convection conditions associated with the processes. However, obtaining a reliable knowledge base for guiding process improvements is made difficult by several complicating features associated with alloy solidification. The chapter highlights that single-domain models for binary solid/liquid-phase- change systems have contributed to enhancing the knowledge base, and the results of several computational studies were reviewed to demonstrate the potential of the models to predict convective transport phenomena for a wide variety of process conditions. Possible means of intelligently controlling alloy-solidification processes were discussed and the role of numerical simulation in developing control strategies was reviewed.