Research progress in thin-wall effect of alloy materials for turbine blades

recent years, with the rapid development of aerospace technology, the requirements for engine thermal efficiency and light weight are getting higher and higher, resulting in the continuous reduction of the wall thickness of turbine blades. However, the reduction in wall thickness leads to decreased properties of the alloy material for blades, i. e., the thin-wall effect. Therefore, the study of the thin-wall effect is of great significance to the safe and stable operation of turbine engines. However, the reasons and laws of the thin-wall effect are very complicated. Based on this, this paper reviews the influence of experimental conditions, surface states of materials, coatings, polycrystals, single crystals, and anisotropy of alloys on the thin-wall effect of alloy materials for blades, and summarizes three typical cases according to the mechanism and model of the thin-wall effect: the oxidative damage model, the oxidation-creep damage model and an analysis based on crack growth. Due to oxidation and the presence of hard and brittle phases, cracks are inevitably generated in the workpiece during service. Based on the crack growth analysis, it is shown that there is a significant correlation between crack growth and thin-wall effect, providing new insights for future research on thin-wall effects.