Nickel-based single crystal superalloy is one of the key materials for turbine blades used for current aeroengines. The porosity defect has a significant influence on the reliability and durability of turbine blades. Conventional experimental analysis is often limited by qualitative rules. Recent developments of numerical simulation and threedimensional characterization techniques facilitate to reveal the formation and evolution mechanisms of porosity defects in Ni-based single crystal superalloys and precisely predict their geometrical features

distribution

and volume fraction. Here we review the research progress on the numerical simulation of porosity defects

and discuss the features of current porosity prediction models. To provide possible guidances for multiscale modeling of porosity formation in nickel-based single crystal superalloys

the potential barriers that prevent quantitative prediction and control of porosity defects from casting to final service are proposed.