Tensile Creep Behaviors of a P-Type Structure Single Crystal Nickel-Base Superalloy

摘要

By means of pre-compressive stress treated, the cubic y' 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.