Numerical modeling and experiment of counter-gravity casting for titanium alloys

The filling capacity and solidification behavior during counter-gravity casting of the titanium alloy Ti-6Al-4V were investigated. ProCAST code was used to optimize filling technology and predict defects through casting simulation. Cast parts with highly accurate dimensions were acquired. The filling capacity and positions of shrinkage porosity were in good agreement with those predicted via simulation. Tensile test results showed that the cast parts of Ti-6Al-4V produced via counter-gravity casting exhibit good balance between strength and ductility, which are comparable to tensile properties of cast Ti-6Al-4V produced in gravity casting subjected to hot isostatic pressing + annealing status.