A correlation to describe interfacial heat transfer coefficient during solidification of Al–Si alloy casting

A thin wall Al–9 wt.% Si alloy casting was made in a sand mold prepared by CO2 process. The thermal history obtained from the experiment was used to solve an inverse heat conduction problem (IHCP). The IHTC was estimated by an iterative algorithm based on the function specification method. Acquired IHTC values are given as a function of time and as a function of the casting surface temperature at the interface. It has been found that pattern of IHTC variation with casting surface temperature can be described by an equation which has been proposed as a new correlation model. In order to verify broader applicability of the proposed correlation, its use is demonstrated on the IHTC results taken from the literature.

► IHTC between Al–9 wt.% Si alloy casting and CO2 sand mold. ► IHTC was described as a function of the casting surface temperature. ► A correlation has been proposed to describe experimentally determined IHTC values. ► Correlation can be used for various conditions of horizontally solidifying melts.