The mechanisms of hot salt stress corrosion cracking in titanium alloy Ti-6Al-2Sn-4Zr-6Mo

Joseph, Susmitha; Lindley, T.C.; Dye, David; Saunders, Edward A.

doi:10.1016/j.corsci.2018.02.025

Cited by 48 publications

(28 citation statements)

References 23 publications

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“…Metallic Ag could be formed though the cathodic reaction, assuming silver ions freely diffuse from the salt coated region through the interface between oxide and base alloy. Besides, it has been found that Al and Zr are very active and able to diffuse upward to react, which conforms to the findings from previous studies [3,4]. The hollow structure might result from the expansion of Ag particles or formation of gaseous chlorides on the Ag particles.…”

Section: Discussionsupporting

confidence: 90%

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Hot salt stress corrosion cracking by silver chloride in Ti-6Al-2Sn-4Zr-6Mo

et al. 2020

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Hot salt stress-corrosion cracking (HSSCC) of titanium alloys has been found in the presence of chloride and other halide salts. Here, a series of AgCl HSSCC tests on Ti-6246 were conducted using a two-point bending rig at 380-500°C to determine the boundary conditions of stress and temperature. Rapid failure occurred after 24 hours above 440 °C, whilst the trigger stress of HSSCC was determined to be 400 MPa at 380 °C. Energy dispersive X-ray during scanning transmission electron microscopy (STEM-EDX) suggested the formation of metallic silver and chlorides of active alloying elements Al, Sn and Zr. The transgranular fracture surface is expected to be linked to an underlying hydrogen embrittlement via hydrogen charging from the corrosion reactions.

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Section: Discussionsupporting

confidence: 90%

“…Recently, NaCl HSSCC in Ti-6246 was studied at 350-450 °C [3][4][5]. Trace Cl was detected by EDX in the corrosion products formed on the fracture surface and in adjacent corrosion pits.…”

Section: Introductionmentioning

confidence: 99%

Hot salt stress corrosion cracking by silver chloride in Ti-6Al-2Sn-4Zr-6Mo

et al. 2020

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“…Corrosion scales also appeared layered, composed of a rather dense inner part and a rather porous outer part [19][20][21]. The external part of the corrosion scales was reported to be generally composed of rutile TiO 2 , surmounted by a mixed Na-,Ti-rich oxide (Na 4 Ti 5 O 12 [10,[22][23][24][25][26], Na 2 Ti 6 O 13 [23], Na 2 TiO 4 [27], Na 2 TiO 3 [5,20,28,29], NaTiO 2 [30]), whereas its internal part also included oxides of certain alloying elements (Al 2 O 3 , ZrO 2 and SnO 2 ) [19,22]. Formation of these corrosion products were often hypothesized to result from active corrosion mechanisms involving volatile chlorides [5,10,20,[22][23][24][25][26][28][29][30][31] and, more rarely, chloride ions [19,22].…”

Section: Introductionmentioning

confidence: 99%

“…This later gas release might justify the presence of blisters and pores. Furthermore, the presence of salts on the material surface was found to strongly influence the formation of the OAZ, which is replaced in this case by an internal oxidation area [10,20,[22][23][24][25]28].…”

Section: Introductionmentioning

confidence: 99%

“…Such internal oxidation area, unusual for Ti and Ti-based alloys, seems to first develop along grain boundaries of the metallic matrix, before expanding inside the grains [19,20,23,25,[28][29][30]. In some cases, this expansion inside the metallic grains appears inhomogeneous and directional, looking like spaced oxide fingers growing in parallel directions [19,22,23].…”

Section: Introductionmentioning

confidence: 99%

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Degradation mechanism of Ti-6Al-2Sn-4Zr-2Mo-Si alloy exposed to solid NaCl deposit at high temperature

et al. 2020

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This study focuses on the corrosion behaviour of Ti-6Al-2Sn-4Zr-2Mo-Si alloy in presence of NaCl deposit in air at 560°C. The active oxidation mechanism at the origin of the corrosion phenomenon enhancement in presence of solid NaCl is thought to be connected to the formation of both external and internal thick oxidation areas. Thermodynamic calculations allowed showing the role played by the different alloying elements in the formation of the external oxide and detailed TEM characterisations brought new insights regarding the nature and origin of the internal oxidation area.

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Effect of plasma electrolytic oxidation on the hot salt corrosion fatigue behavior of the TC17 titanium alloy

Shi

Liu

Zhang

et al. 2021

Materials & Corrosion

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In this paper, the effect of plasma electrolytic oxidation (PEO) on the hot salt corrosion fatigue (HSCF) behavior of the TC17 titanium alloy at 420°C was investigated. Through microstructure characterization and fatigue fracture analysis, combined with a comparative study of its hot salt corrosion behavior, the mechanism of PEO on HSCF behavior was also investigated. The results showed that the high‐temperature fatigue resistance of the TC17 titanium alloy was significantly reduced by the deposition of 0.4 mg/cm2 of solid NaCl compared with that without a salt coating. This behavior was observed because the corrosion pits caused by hot salt corrosion promoted the initiation of fatigue cracks, and hydrogen penetration promoted the growth of fatigue cracks. However, the HSCF resistance of the TC17 alloy with the PEO ceramic coating could be effectively increased. This was because the PEO ceramic coating with high bonding strength and good compactness effectively inhibited hot salt corrosion damage and delayed the formation of the resident slip zone and hydrogen permeation, thereby inhibiting the initiation and propagation of fatigue cracks.

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The mechanisms of hot salt stress corrosion cracking in titanium alloy Ti-6Al-2Sn-4Zr-6Mo

Cited by 48 publications

References 23 publications

Hot salt stress corrosion cracking by silver chloride in Ti-6Al-2Sn-4Zr-6Mo

Hot salt stress corrosion cracking by silver chloride in Ti-6Al-2Sn-4Zr-6Mo

Degradation mechanism of Ti-6Al-2Sn-4Zr-2Mo-Si alloy exposed to solid NaCl deposit at high temperature

Effect of plasma electrolytic oxidation on the hot salt corrosion fatigue behavior of the TC17 titanium alloy

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