Corrosion-induced deceleration-to-acceleration of fatigue crack growth for deep-sea Ti6Al4V ELI titanium alloy

Zhao, Yang; Yu, Pengfei; Wu, Leilei; Zhang, Xin; Wei, Pengyu; Zhao, Junhua

doi:10.1016/j.engfracmech.2023.109160

Cited by 8 publications

(3 citation statements)

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“…With the decrease in stress amplitude, the fatigue life of TC4-F alloy in CS increases to 15,074 cycles under low stress amplitude of 650 MPa, which is 56% lower than that in LA. The testing time for TC4-F alloy in CS is given in Figure 4b, which shows that at high stress amplitude of 910 MPa, the contacting time between the fatigue sample and the 3.5% NaCl corrosion solution is only 0.13 h, while the contacting time at low stress amplitude of 650 MPa is up to about 8.4 h. It follows that the LCCF deformation mechanisms of TC4-F alloy in CS under low stress amplitudes are totally different from that under high stress amplitude, which is consistent with the results of other titanium alloys tested in laboratory air and a corrosive medium [17,25].…”

Section: Fatigue Lifesupporting

confidence: 86%

“…amplitude of 910 MPa, the contacting time between the fatigue sample and the 3.5% NaCl corrosion solution is only 0.13 h, while the contacting time at low stress amplitude of 650 MPa is up to about 8.4 h. It follows that the LCCF deformation mechanisms of TC4-F alloy in CS under low stress amplitudes are totally different from that under high stress amplitude, which is consistent with the results of other titanium alloys tested in laboratory air and a corrosive medium [17,25].…”

Section: Fatigue Lifesupporting

confidence: 86%

“…It is well known that titanium equipment in deep-sea service is subjected to greater fatigue loading and more severe corrosive environments. Accordingly, fatigue damage increases the corrosion of titanium alloys, and corrosion damage to titanium alloy also accelerates fatigue crack growth [25], both of which interact with each other, posing a huge challenge for TC4-F alloy used in deep-sea equipment manufacturing. But considering the actual service conditions, the effects of the corrosion environment on the LCF property and the failure mechanisms of the TC4-F alloy have not yet been determined.…”

Section: Introductionmentioning

confidence: 99%

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Low-Cycle Corrosion Fatigue Deformation Mechanism for an α+β Ti-6Al-4V-0.55Fe Alloy

Sun,

Qian,

Chang

et al. 2024

Metals

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Titanium alloys with high strength and good corrosion resistance have become one of the critical bearing structural materials in marine engineering. But in service, corrosion fatigue would occur under the synergetic action of cyclic external load and corrosion environment, threatening the safety of components. In this study, compared with low-cycle fatigue in laboratory air, the low-cycle corrosion fatigue deformation mechanism and fracture characteristic of the Ti-6Al-4V-0.55Fe alloy were investigated in 3.5% NaCl corrosion solution under selected stress amplitudes. The results showed that under low stress amplitude, corrosion fatigue was determined by fatigue damage and corrosion damage, causing a reduction in fatigue life. The local stress concentration caused by corrosion pits and dislocations pile-up accelerated the initiation of fatigue cracks, and other corrosion behavior including crevice corrosion promoted fatigue crack propagation; the corrosion solution increased the surface damage. While under high stress amplitude, due to the short contact time between the sample and solution and higher applied stress, the fatigue life is determined by fatigue damage caused by multiple slips.

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Section: Fatigue Lifesupporting

confidence: 86%

Section: Fatigue Lifesupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

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