Tensile Creep Behaviors of a P-Type Structure Single Crystal Nickel-Base Superalloy
By means of pre-compressive stress treated, the cubic γ΄ phase in alloy is transformed into the P-type structure along the direction parallel to the applied stress axis. The influence of the P-type structure on the creep lifetimes of alloy has been investigated by means of the tensile creep testing and microstructure observation. Results show that, compared with the A structure alloy, the P-type γ′ rafted alloy displays a shorter creep lifetimes under the experimental conditions. The microstructure evolution of the P-type structure alloy occurs during tensile creep, in which the p-type γ′ rafted phase is transformed into the N-type structure. The microstructure evolution alloy reduces the creep resistance of the alloy, this is one of the main reasons for reducing the creep resistance of the one.
Yafang Han et al.
H. Q. Du et al., "Tensile Creep Behaviors of a P-Type Structure Single Crystal Nickel-Base Superalloy", Materials Science Forum, Vols. 546-549, pp. 1345-1348, 2007