AgCl-induced hot salt stress corrosion cracking in a titanium alloy

Shi, Yitong; Joseph, Susmitha; Saunders, Edward A.; Sandala, Rebecca; Walker, Adrian; Lindley, T.C.; Dye, David

doi:10.1016/j.corsci.2021.109497

Cited by 22 publications

(4 citation statements)

References 47 publications

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“…The anode metal atoms are constantly dissolved, and because the anode area is small, the current density of the anode will be large, which will lead to further corrosion of the fresh substrate. In this process, the following reactions occurred [29,30]:…”

Section: Discussionmentioning

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: Discussionmentioning

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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“…2-point bend testing experiments were performed on coated samples, pre-loaded at 0.6 pct strain to crack the coating (the estimated ductility of the coating was 0.5 pct), then unloaded to 0.3 pct strain for the heat treatment at 550 °C. 2-point bend testing was performed with Inconel 718 testing jigs (according to ASTM-G41, using a similar method as previously published literature [ 23 ] ) shown in Figure 1 , which were machined in-house and specifically produced for these experiments.…”

Section: Experimental Methodsmentioning

confidence: 99%

Effect of NaCl and Na2SO4 on Low Temperature Corrosion of Vapour- and Pack-Aluminide Coated Single Crystal Turbine Blade Alloys CMSX-4 and RR3010

Tjandra,

Ranjan,

Ackerman

et al. 2023

Metall Mater Trans A

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The current work presents a systematic study of two alloy compositions (RR3010 and CMSX-4) and two types of coatings: inward grown (pack) and outward grown (vapour) deposited aluminides, exposed to 98Na2SO4–2NaCl mixture. Grit blasting was used on some of the samples, prior to coating, to mimic in-service procedures and remove oxides from the surface prior to coating. Two-point bend tests were then performed on the coated samples, with and without applied salt at 550 °C for 100 hours. Samples were pre-strained at 0.6 pct strain to deliberately pre-crack the coating and then strained at 0.3 pct for the heat treatment. Exposure to 98Na2SO4–2NaCl under applied stress of vapour-aluminide coated samples of both alloys, revealed significant coating damage in the form of secondary cracks in the intermetallic-rich inter-diffusion zone, although only CMSX-4 exhibited cracks propagating further into the bulk alloy while RR3010 proved more resistant. The pack-aluminide coating proved more protective for both alloys, with cracks propagating only into the coating and never into the underlying alloy. In addition, grit blasting proved beneficial in reducing spallation and cracking for both types of coating. The findings were used to propose a mechanism based on thermodynamic reactions, to explain the crack width changes through the formation of volatile AlCl3 in the cracks.

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“…So far, there have been increasing studies to explain the mechanism of the above three types of hydrogen embrittlement failure. Accordingly, several theories have been formed [ 1 , 9 , 10 , 11 , 12 , 13 ], such as (i) hydrogen pressure (HP), (ii) hydrogen adsorption reduced surface energy (HARSE), (iii) hydrogen-enhanced localized plasticity (HELP), (iv) hydrogen-enhanced decohesion (HEDE), and (v) Adsorption-Induced Dislocation Emission (AIDE). HP suffers from a lack of explanation for the diffusion and enrichment of hydrogen caused by stress, whereas HARSE is not capable of describing the hydrogen-induced fracture of the plastic metals.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation for Hydrogen-Assisted Cracking: An Explicit Phase-Field Formulation

Wang

Chen

2023

Materials

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Hydrogen-assisted cracking is one of the most dominant failure modes in metal hydrogen-facing materials. Therefore, the hydrogen-assisted cracking mechanism has been a hot topic for a long time. To date, there is very little published research on numerical methods to describe hydrogen-assisted cracking. This paper presents a new method for the description of hydrogen embrittlement crack growth: an explicit phase-field formulation, which is based on the phase-field description of cracks, Fick’s mass diffusion law, and the relationship between hydrogen content and fracture surface energy. A novel computational framework is then developed using the self-developed FEM software DYNA-WD. We numerically calculate several typical conditions in the 3-D coordinates to validate the effectiveness of the proposed computational framework. Specifically, we discuss (i) the failure of a square plate in a hydrogenous environment, (ii) the CT specimen failed with the inner hydrogen, (iii) the plate /failed with the corrosives, and (iv) the failure of the disk test. Finally, the relationship between Mises stress, the concentration of hydrogen, the thickness of the disc, and the loading rate is investigated.

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AgCl-induced hot salt stress corrosion cracking in a titanium alloy

Cited by 22 publications

References 47 publications

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

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

Effect of NaCl and Na2SO4 on Low Temperature Corrosion of Vapour- and Pack-Aluminide Coated Single Crystal Turbine Blade Alloys CMSX-4 and RR3010

Numerical Simulation for Hydrogen-Assisted Cracking: An Explicit Phase-Field Formulation

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