Quantitative Evaluation of Shrinkage Porosity in AlSi9 Cast Alloy as Function of Titanium Addition and Casting Parameters

Abstract

In the present research, effects of titanium addition as grain refiner combined with casting parameters on the porosity in the AlSi9 alloy was studied. Porosity was investigated via TATUR test. The casting parameters studied are: pouring temperature and initial mold temperature. The total porosity was experimentally quantified by densimetry method. A small decrease in porosity value was observed with increasing the pouring temperature from 700 to 800 °C. It has been found that the effect of grain refinement by titanium addition on the porosity is more important, when the liquid metal was poured at 700 °C. Specimen poured in preheated mold at 300 °C present small values of porosity.