The process for investment casting IN718 alloy turbine castings was simulated by the ProCAST software

and the temperature field during solidification process was visualized

and porosity shrinkage criterion was used to predict the position where shrinkage defects easily occurs.According to the simulated results

the gating system was modified

so the quality of turbine castings was improved.The castings produced by the improved process have no obvious absent defects under X-ray detection

and the relative density of the castings was reached up to 99.8%.