Abstract
Abstract Temperature dependency of fatigue crack growth behavior in β containing forged TiAl alloys is investigated. Two kinds of material with nearly-lamellar and triplex microstructures are employed in fatigue crack growth tests at room temperature, 400 °C and 760 °C. A series of ΔK increasing and decreasing tests exhibits that at room temperature the fatigue crack growth resistance of triplex microstructure is lower than that of nearly-lamellar microstructure, whereas the resistance of triplex becomes higher at 760 °C. This higher resistance of triplex microstructure at high temperature is mainly attributed to the higher volume fraction of ductile β phase. The values of fatigue crack growth threshold in two microstructures show almost comparable at three temperatures, and they reveal the same temperature dependency. The threshold is found to be the highest at 760 °C, while the lowest at 400 °C. This temperature-dependency of fatigue threshold should be related to the roughness-induced and oxidation-induced crack closure mechanisms.
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