High-Temperature Creep Behavior of a Ni-Based Superalloy for Advanced Ultra-Supercritical Coal-Fired Power Plants

• The novel Ni-based superalloy demonstrates superior creep resistance at 650-750°C, with steady-state creep rates following the Norton power law. • γ' phase precipitation and interfacial dislocation networks are the dominant strengthening mechanisms, enhancing high-temperature performance. • A Larson-Miller parameter correlation accurately predicts creep rupture life, facilitating component design and life assessment. • Fracture mode transitions from ductile transgranular to intergranular with increasing temperature, linked to γ' coarsening and grain boundary weakening.