Effect of pre-compressive treatment on creep behavior of a 〈0 1 1〉-oriented single-crystal Ni-based superalloy

The effect of pre-compressive treatment on the steady-stage creep behavior of a 〈0 1 1〉-oriented single-crystal Ni-based superalloy was studied. Results show that pre-compression at 1040 °C/180 MPa along the [1 0 0] orientation improves the tensile creep strength of the alloy along the [0 1 1] orientation at 850 °C/400 MPa and 1040 °C/137 MPa. The elimination of gable channels, the relatively narrow roof channels and the more activated slip systems of dislocations are responsible for the better creep resistance of the pre-compressed alloy.