Effect of hydrostatic pressure on stress corrosion susceptibility of low-cost titanium alloy plates and tubes

ZHU Yuhui; YANG Shengli; DANG Hengyao; JIANG Tiantian; GAO Fuyang; LIU Qianli; LÜ Yifan

doi:10.7513/j.issn.1004-7638.2025.05.019

Volume 46 Issue 5

Oct. 2025

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ZHU Yuhui, YANG Shengli, DANG Hengyao, JIANG Tiantian, GAO Fuyang, LIU Qianli, LÜ Yifan. Effect of hydrostatic pressure on stress corrosion susceptibility of low-cost titanium alloy plates and tubes[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(5): 177-183. doi: 10.7513/j.issn.1004-7638.2025.05.019

Citation:

ZHU Yuhui, YANG Shengli, DANG Hengyao, JIANG Tiantian, GAO Fuyang, LIU Qianli, LÜ Yifan. Effect of hydrostatic pressure on stress corrosion susceptibility of low-cost titanium alloy plates and tubes[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(5): 177-183. doi: 10.7513/j.issn.1004-7638.2025.05.019

Citation:

ZHU Yuhui, YANG Shengli, DANG Hengyao, JIANG Tiantian, GAO Fuyang, LIU Qianli, LÜ Yifan. Effect of hydrostatic pressure on stress corrosion susceptibility of low-cost titanium alloy plates and tubes[J]. IRON STEEL VANADIUM TITANIUM, 2025, 46(5): 177-183. doi: 10.7513/j.issn.1004-7638.2025.05.019

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Effect of hydrostatic pressure on stress corrosion susceptibility of low-cost titanium alloy plates and tubes

doi: 10.7513/j.issn.1004-7638.2025.05.019

ZHU Yuhui^1
,,
YANG Shengli^{1, 2},
DANG Hengyao¹,
JIANG Tiantian¹,
GAO Fuyang^{1, 2},
LIU Qianli^{1, 2},
LÜ Yifan^{1, 2}

1.
Luoyang Ship Materials Research Institute, Luoyang 471023, Henan, China
2.
National Key Laboratory of Marine Corrosion and Protection, Luoyang 471023, Henan, China

More Information

Received Date: 2025-03-03
Accepted Date: 2025-04-14
Rev Recd Date: 2025-03-31
Publish Date: 2025-10-30

Abstract

Abstract

This paper investigates the stress corrosion cracking (SCC) susceptibility of low-cost Ti6411 plate, Ti52 tube, marine TC4 ELI, and Ti80 alloys under simulated deep-water environment pressure using a high-pressure autoclave testing system. Slow-strain-rate tests (10⁻⁵, 10⁻⁶/s, and 10⁻⁷/s) were exposed to 3.5% NaCl solution and dry air with a hydrostatic pressure of 7.5 MPa. The tensile parameters and stress corrosion susceptibility index (I_SSRT) were obtained. Furthermore, the microstructures and fracture features have been observed to elucidate the stress corrosion behavior and failure mechanisms of low-cost titanium alloy plates and tubes using OM and SEM under simulated deep-water pressure. The results indicated that the optimal strain rate is within 10⁻⁵/s and 10⁻⁶/s. Specifically, the I_SSRT values of Ti6411 plate are 10.0% and 9.1% with strain rates of 10⁻⁵/s and 10⁻⁶/s, respectively. A notable stress corrosion susceptibility was obtained. In contrast, all I_SSRT values of Ti52 tube, TC4 ELI, and Ti80 alloys were below 5%, indicating no significant stress corrosion susceptibility. Particularly, Ti6411 plate with lamellar microstructure is sensitive to stress concentration effects and exhibits quasi-cleavage fracture. Some black corrosion products can be observed on the fracture morphologies. It is believed that the corrosion mechanisms were coupled effects of selective anodic dissolution and hydrogen embrittlement. Hydrostatic pressure can promote Cl^- to weaken the passive film and increase hydrogen content. As a result, both of the tensile loading and internal hydrogen pressure reduce the corrosion resistance of the titanium alloys.
- low-cost titanium alloys,
- hydrostatic pressure,
- stress corrosion cracking susceptibility

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References(16)

References

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