Creep Behaviors and Deformation Mechanisms at Intermediate Temperatures in a Novel γ‐γ′ Nickel‐Based Superalloy

Abstract

The creep behaviors of a novel polycrystalline nickel‐based superalloy are investigated at a wide applied stress range of 500–950 MPa and temperature ranging from 650 to 750 °C. And the microstructure and deformation mechanisms are also analyzed. The results indicate that all creep curves of the novel nickel‐based superalloy are mainly consist of the primary and accelerated stages, whereas the steady‐state stage is not obviously observed. The minimum creep rate increases and the corresponding creep life decreases with the applied stress increasing at constant temperature. The relative longer creep life at 650 °C could be attributed to the coupling of stacking faults in the interior of γ′ and deformation twinning.