The creep-fatigue behavior of TC4 ELI alloy under simulated deep-sea environments

BIAN Fang; LIU Ke; LI Mengsha; WANG Zhiwei; WANG Qi; SUN Dongbai

doi:10.7513/j.issn.1004-7638.2025.05.020

Volume 46 Issue 5

Oct. 2025

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BIAN Fang, LIU Ke, LI Mengsha, WANG Zhiwei, WANG Qi, SUN Dongbai. The creep-fatigue behavior of TC4 ELI alloy under simulated deep-sea environments[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(5): 184-189, 204. doi: 10.7513/j.issn.1004-7638.2025.05.020

Citation:

BIAN Fang, LIU Ke, LI Mengsha, WANG Zhiwei, WANG Qi, SUN Dongbai. The creep-fatigue behavior of TC4 ELI alloy under simulated deep-sea environments[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(5): 184-189, 204. doi: 10.7513/j.issn.1004-7638.2025.05.020

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The creep-fatigue behavior of TC4 ELI alloy under simulated deep-sea environments

doi: 10.7513/j.issn.1004-7638.2025.05.020

BIAN Fang^1
,,
LIU Ke²,
LI Mengsha^{1, 3},
WANG Zhiwei¹,
WANG Qi¹,
SUN Dongbai^{1, 3}

1.
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519001, Guangdong, China
2.
Pangang Group Research Institute Co., Ltd., Chengdu 610300, State Key Laboratory of Vanadium and Titanium Resource Comprehensive Utilization, Panzhihua 617000, Sichuan, China
3.
School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510006, Guangdong, China

More Information

Received Date: 2024-12-10
Accepted Date: 2025-04-14
Rev Recd Date: 2025-04-07
Publish Date: 2025-10-30

Abstract

Abstract

To address the unknown creep-fatigue damage mechanism of TC4 ELI titanium alloy in deep-sea multi-factor coupled environment, a high-pressure corrosion test system was used to simulate the seawater environment at 200, 600 m, and 6000 m in the South China Sea, and the cyclic stress life response and damage evolution law of TC4 ELI alloy were systematically studied. The experiment provided the cyclic stress-fatigue life data of TC4 ELI alloy under different environmental conditions. The results show that the cyclic stress-life relationship of creep-fatigue in the deep-sea environment can be characterized by the Basquin equation. The creep fatigue life with guaranteed load time is significantly reduced compared to that of pure fatigue; Under the same loading conditions, the fracture strain during the fatigue process is equivalent, and the fatigue life depends on the rate of strain increase. The stable stage of the cyclic strain-time curve shows the superimposed response of the creep rate and the plastic deformation of pure fatigue. Multiple-source crack initiations were observed on the fracture surface by Scanning Electron Microscopy, with no obvious crack propagation zone. The fatigue life is mainly the crack initiation life, indicating that the crack initiation mechanism is different in deep-sea environments and air.
- deep-sea environmental factors,
- creep-fatigue,
- fatigue life,
- crack initiation

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References(15)

References

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