氢对TC4ELI钛合金疲劳裂纹扩展行为影响

doi:10.11896/cldb.24080102

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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.

Key words： hydrogen TC4ELI titanium alloy hydrogen damage fatigue crack growth loading frequency

Published: 25 July 2025 Online: 2025-07-29

CLC number:

V252.2

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	YANG Riming
	SHEN Xiuli
	DONG Shaojing

Cite this article:

YANG Riming,SHEN Xiuli,DONG Shaojing. Influence of Hydrogen on Fatigue Crack Growth Behavior of TC4ELI Titanium Alloy[J]. Materials Reports, 2025, 39(14): 24080102-5.

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https://www.mater-rep.com/EN/10.11896/cldb.24080102 OR https://www.mater-rep.com/EN/Y2025/V39/I14/24080102

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