Enhanced creep properties of nickel-base single crystal superalloy CMSX-4 by high magnetic field

摘要

The creep properties of nickel-base single crystal superalloy CMSX-4 with and without high magnetic field at 980 °C/250 MPa are investigated. Superalloy CMSX-4 is shown with an excellent rupture life under high magnetic field. Fracture surface results indicate that small square-shaped facets are shown and microporosities are formed at the bottom of dimple without high magnetic field, while the dimple surface shows large square-shaped facets and microporosities disappear from the bottom of dimple with high magnetic field. The mechanism of the enhancement of rupture life and the change of fracture behavior are explored in detail.