Influence of Hydrogen on Fatigue Crack Growth Behavior of TC4ELI Titanium Alloy
YANG Riming1,2, SHEN Xiuli1,2, DONG Shaojing1,2,*
1 School of Energy and Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China 2 Collaborative Innovation Center for Advanced Aero-Engine, Beijing 100191, China
Abstract: The new TC4ELI titanium alloy exhibits significant potential for application in hydrogen fuel engines, but it faces the risk of hydrogen damage. Therefore, investigating the influence of hydrogen on fatigue crack growth behavior is of great significance. In this work, taking the TC4ELI titanium alloy treated by high-temperature gaseous hydrogen as samples. The microstructure evolution, hydride formation and distribution of the samples were analyzed using techniques such as X-ray diffraction and secondary ion mass spectrometer. Fatigue crack growth tests at different loading frequencies were carried out, furthermore, the crack growth path and fracture morphology were combined for further analysis. The results show that:(1) hydrogen charging promotes the transformation of α phase into β phase within TC4ELI, resulting in an increased volume fraction of β phase. Hydrogen atoms predominantly accumulate in the β phase and at grain boundaries, leading to the precipitation of hard and brittle δ hydrides. (2)The increase in β phase volume fraction along with δ hydride precipitation causes a transition in crack growth of hydrogen-charged TC4ELI from the transgranular mode to the mixed mode involving both transgranular and intergranular, thereby accelerating the rate of fatigue crack growth. (3)When the loading frequency is below 0.1 Hz, there is sufficient time for hydrogen to diffuse and accumulate at the crack tip region, which significantly enhances its effect on accelerating fatigue crack growth rate in TC4ELI.
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2025, Vol. 39 
