STRESS CORROSION CRACKING OF TITANIUM ALLOYS. Progress Report, January 1-- March 31, 1965.

Rideout, S. P.; Louthan, McIntyre R.; Selby, C.L.

doi:10.2172/4523836

Cited by 3 publications

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“…However, under certain environmental conditions, the adherent and protective TiO 2 scale is broken down, exposing the underlying metal to attack. [5] The unwelcome discovery of this problem in the 1960s led to extensive research, [6][7][8][9][10][11][12] which has continued to the present day. [13,14] In 1972, Blackburn et al (in Reference 15) found titanium to be susceptible to stress corrosion cracking (SCC) under a variety of aggressive media, including nitric acid, nitrogen tetroxide, and molten salts.…”

Section: Introductionmentioning

confidence: 99%

“…Particular consideration was given to the effect of NaCl at temperatures above~300 deg. [9] Titanium was found to be highly vulnerable to SCC in the presence of aqueous sodium chloride, which was of particular concern in aerospace service applications.…”

Section: Introductionmentioning

confidence: 99%

“…Some studies suggested a mechanism involving the production of HCl (g) , and a consequent dissociation of the hydrogen chloride into chloride ions and dissolved hydrogen in solution. [8,9,11] Hydrogen is known be detrimental to the mechanical properties of Ti alloys, including a loss in ductility and enhanced crack growth rates in fatigue. [16] Several mechanisms for this have been offered.…”

Section: Introductionmentioning

confidence: 99%

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The Dislocation Mechanism of Stress Corrosion Embrittlement in Ti-6Al-2Sn-4Zr-6Mo

Chapman

Vorontsov

Sankaran

et al. 2015

Metall Mater Trans A

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An observation of the dislocation mechanisms operating below a naturally initiated hot-salt stress corrosion crack is presented, suggesting how hydrogen may contribute to embrittlement. The observations are consistent with the hydrogen-enhanced localized plasticity mechanism. Dislocation activity has been investigated through post-mortem examination of thin foils prepared by focused ion beam milling, lifted directly from the fracture surface. The results are in agreement with the existing studies, suggesting that hydrogen enhances dislocation motion. It is found that the presence of hydrogen in (solid) solution results in dislocation motion on slip systems that would not normally be expected to be active. A rationale is presented regarding the interplay of dislocation density and the hydrogen diffusion length.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Dislocation Mechanism of Stress Corrosion Embrittlement in Ti-6Al-2Sn-4Zr-6Mo

Chapman

Vorontsov

Sankaran

et al. 2015

Metall Mater Trans A

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Effects of Environment on Cracking in Titanium Alloys

Hatch

Rosenberg

Erbin

1966

Stress-Corrosion Cracking of Titanium

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The laboratory conditions under which hot-salt cracking can occur in titanium alloys are reviewed and orders of merit among the alloys established. The large differences among alloys give promise of new alloys immune to the phenomenon. Hot-salt cracking is a case of classical stress corrosion. Alloy research and development disclose a system of titanium alloys that is immune to hot-salt cracking. One promising composition, Ti-2Al-4Zr-4Mo, is shown to have excellent combinations of mechanical properties. The fracture toughness of commercial titanium alloys in salt water is also examined. In the presence of fatigue cracks actively extending under applied loads, salt water can have the effect of reducing the crack propagation resistance of several titanium alloys. Because salt water has no effects on titanium alloys in the absence of cracks, its environmental effect is not classical stress corrosion. The problem can be largely eliminated in Ti-8Al-1Mo-1V sheet by creating microstructures consisting of a continuous matrix of transformed beta.

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Chemical and Physical Mechanisms of Salt Stress-Corrosion Cracking in the Titanium 8-1-1 Alloy

Logan

McBee

Bechtoldt

et al. 1966

Stress-Corrosion Cracking of Titanium

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Stress-corrosion tests were performed on hollow cylinders and sheet-metal specimens of Ti-8Al-1Mo-1V in contact with solid sodium chloride or synthetic sea-water salt. Specimens were heated to 750 F and subjected to a 73,500 psi tensile stress. Specimens failed in times as short as 18 hr. The hollow specimens were evacuated and then filled with oxygen or argon. No cracking occurred unless oxygen or water vapor was present. Cracking was also introduced in specimens preoxidized for about 65 hr and coated with sodium chloride in an inert atmosphere under the same condition of temperature and stress. The authors propose that chlorine diffuses down through a stress, and probably an oxygen concentration gradient reacts with the metal to destroy atomic bonds and produce stress corrosion. Specific reactions, however, have not yet been determined. X-ray diffraction studies of corrosion products indicate that the usual oxides of titanium are present along with an unidentified phase that may be formed by reaction between sodium chloride, oxygen, and the alloy.

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STRESS CORROSION CRACKING OF TITANIUM ALLOYS. Progress Report, January 1-- March 31, 1965.

Cited by 3 publications

References 0 publications

The Dislocation Mechanism of Stress Corrosion Embrittlement in Ti-6Al-2Sn-4Zr-6Mo

The Dislocation Mechanism of Stress Corrosion Embrittlement in Ti-6Al-2Sn-4Zr-6Mo

Effects of Environment on Cracking in Titanium Alloys

Chemical and Physical Mechanisms of Salt Stress-Corrosion Cracking in the Titanium 8-1-1 Alloy

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