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Abstract
The complex shape of helical impellers in centrifugal pumps increases the difficulty of investment casting. Determining means of predicting the form and location of defects in order to prevent the formation of defects is crucial to the casting process. This study employed AnyCasting to conduct flow analysis on the moulding of 17-4PH stainless steel impellers in centrifugal pumps. We identified the mechanisms underlying the formation of shrinkage defects that occur during pouring and solidification. To improve the casting process, the riser dimensions and gating system were optimised based on data obtained from mathematical modelling, which took into account the thermodynamic behaviour of the materials involved.