Abstract
Inconel 718 superalloy is one kind of important metallic materials used for manufacturing turbine discs in aero-engine. Since the turbine disc usually bears overloading which will lead to the low cycle fatigue (LCF) damage in real working, and because it is added with high ratio alloying elements, it is meaningful to decide the relationship between the LCF degradation and microstructure evolution. In the present study, LCF behavior of Inconel 718 alloy during long-term aging was investigated. The microstructure evolutions of Inconel 718 alloy during long-term aging at 750 °C for 500, 100, 1500 and 2000 h, respectively and the influences of long-term aging on the LCF behavior were investigated. The results show that the size of γ″ phases increases and the volume fraction decreases with the increase of aging time, compared with the increase of both size and volume fraction of δ phases. Both the fatigue strength and fatigue life of the alloy decrease with the increase of aging time.
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