Fatigue behaviors of a nickel-based superalloy after hot-corrosion: Experiments and peridynamic simulations

Superalloys suffer from attack of the hot corrosion, leading to degradation of their fatigue durability. Previous numerical studies, mostly by the finite element method (FEM), are rare in hot-corrosion-intervened fatigue problems. In this paper, the fatigue behaviors after pre-hot-corrosion of a Nickel-based superalloy are experimentally studied. The tests capture the specimen's fatigue lifetime reduction due to hot corrosion. Besides, a peridynamic-based model is built to analyze fatigue behaviors of specimens pre-subjected to hot corrosion. The fatigue failure process of the corroded specimen is numerically described, and the simulated fatigue lifetimes agree well with testing results, validating the effectiveness of the model.