A method for enhancing ductility of a polycrystalline Ni-based superalloy K417G

• HIP and heat treatment reduce porosity from 0.072% to 0.043% and increase γ' phase volume fraction from 43.28% to 56.54%, enhancing ductility at 900°C from 5.1% to 9.8% without compromising tensile strength. • Elimination of micropores via HIP prevents crack initiation, delaying fracture and improving plasticity. • Dislocation bypass of γ' phase via Orowan mechanism after HIP and heat treatment contributes to increased plasticity. • The study provides a viable method for enhancing ductility of K417G superalloy components, crucial for aerospace hot-end applications.