Stress corrosion cracking of the titanium alloys under hydrostatic pressure resulting from the degradation of passive films

Liu, Rui; Xie, Yushi; Jin, Yue; Cui, Yu; Liu, Li; Wang, Fuhui

doi:10.1016/j.actamat.2023.118946

Cited by 18 publications

(1 citation statement)

References 49 publications

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“…Chi [19] proposed that lamellar α microstructure with different orientations and a large α colony can improve crack propagation resistance and reduce SCC in simulated oilfield brine. Liu [20] found that hydrostatic pressure also affects the adsorption and penetration of hydrogen, thus promoting the stress corrosion of titanium alloy. Joseph [21] investigated hot salt stress corrosion cracking in Ti6246 alloy, transgranular fracture, and the existence of hydride, which supported the suggestion that hydrogen charging leads to cracking in stress corrosion scenarios.…”

Section: Introductionmentioning

confidence: 99%

Stress Corrosion Cracking of Ultrafine-Grained Ti-2Fe-0.1B Alloying after Equal Channel Angular Pressing

Huang

Jin

Wang

et al. 2023

Metals

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In the present study, the stress corrosion cracking (SCC) of ultrafine-grained (UFG) Ti-2Fe-0.1B prepared by equal channel angular pressing (ECAP) was investigated by a slow strain rate test (SSRT) with in-site electrochemical equipment. In comparison with the atmosphere, results indicated that the mechanical properties of Ti-2Fe-0.1B alloy degraded in the simulated sea water, and the SCC sensitivity of UFG Ti-2Fe-0.1B alloy is much lower than the initial coarse-grained (CG) state. The enhanced SCC resistance of UFG Ti-2Fe-0.1B alloy could be attributed to the mechanical and corrosive aspects simultaneously. First of all, the strength of UFG Ti-2Fe-0.1B alloy is much higher than the CG state, but the elongation to failure of UFG Ti-2Fe-0.1B alloy decreased more than 1.8 times. The UFG sample suffered crack initiation until failure with a relative short time and low plastic deformation, which weakened the effect of corrosion during SSRT. In addition, X-ray photoelectron spectroscopy (XPS) revealed that the thickness of the passivation film of the UFG Ti-2Fe-0.1B alloy is thicker and that the component of the passivation film possesses a higher proportion of TiO2 in the same etched depth, which is beneficial to the corrosion resistance. Furthermore, according to the in-site electrochemical experiment curves, it is believed that the passivation film has a higher repair ability after cracking during SSRT for the UFG Ti-2Fe-0.1B alloy due to the decrease in grain size and the increase in dislocation density.

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Section: Introductionmentioning

confidence: 99%