The role of moisture and hydrogen in hot-salt cracking of titanium alloys.
Moisture and hydrogen role in hot chloride salt stress corrosion cracking of Ti alloys by radiotracer technique and mass spectrography
Louthan, M. R., Jr.↗
SEARCH · Engineering Papers
Results for “STRESS CORROSION”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Studies of hot salt cracking of the titanium 8 percent Al-1 percent Mo-1 percent V alloy.
Titanium alloys hot salt stress corrosion cracking, studying effects of chlorides and surface oxides
Logan, H. L.↗
Influence of salt and elevated-temperature exposure on the maximum compressive strength of titanium-alloy skin-stringer panels
Fabrication methods and tests for salt-stress corrosion and elevated temperature effects on compressive strength of titanium alloy skin stringer panels
Gardner, J. E.↗
Materials technology for the space shuttle
Materials technology for reuse capability of space shuttle, discussing normal and stress corrosion, hydrogen embrittlement and flammability
Cataldo, C. E.↗
Deformation-assisted nucleation of titanium hydride in an alpha-beta titanium alloy
Titanium hydride deformation assisted nucleation in alpha-beta titanium alloy, showing low strain rate embrittlement and stress corrosion crack propagation in aqueous environments
Boyd, J. D.↗
Titanium alloy pressure vessels in the manned space program
Stress corrosion cracking of Ti alloys in nitrogen tetroxide and methyl alcohol environments in Apollo spacecraft pressure vessels
Johnson, R. E.↗
A study of the mechanism of chemical reactivity of nitrogen tetroxide with titanium alloy Final report, 26 Jan. 1969 - 31 Mar. 1970
Reactions between liquid dinitrogen tetraoxide and titanium alloy that result in stress corrosion cracking
Clarke, J. F. G., Jr.↗
Controlled glass bead peening Patent
Method and apparatus for inducing compressive stresses in pressure vessel to prevent stress corrosion
Bales, T. T.↗
Inhibition of methanol cracking of Ti-6Al-4V foil - Effect of pretreatments with aqueous solutions of electrolytes
Methanol stress corrosion cracking of Ti-Al-V foil inhibited by pretreatment in aqueous solutions of electrolytes, discussing colloidal character of microcrystallites
Fugassi, P.↗
NERVA materials development
Materials development topics include: development of analysis techniques to adjust heterogeneous data; determination of thermal conductivity for AISI 347 stainless steel and elastic moduli and Poisson's ratio for Inconel 718 and Ti 5Al-2.5Sn; embrittlement effects of 1400 psi gaseous hydrogen for alloy 718 and Ti 5Al-2.5Sn; cryogenic radiation damage of Ti 5Al-2.5Sn; and evaluation of prepreg, impregnation, and fabric materials for optimum fibrous graphite properties. Component support topics include: tensile design allowable development of Ti 5Al-2.5Sn for turbopump applications; evaluation of fatigue, fracture toughness, and stress corrosion properties of AA 7039-T63 for pressure vessel applications; development of AISI 347 sheet tensile and creep properties for nozzle applications; evaluation of orbital weld techniques for aluminum line fabrication; material selection of shield materials; development of high load friction and wear properties of hard chrome/gold plate combinations; and evaluation of weld processes for NASS duct coolant channel fabrication.
Mandell, B.↗
SCC of Ti-6Al-4V foil by methanol - Effect of treatments with 2,4-pentanedione and its metal complexes.
The susceptibility of Ti-6Al-4V foil to stress corrosion cracking (SCC) by methanol can be decreased by treatment of the foil with 2,4-pentanedione prior to its immersion in the corroding media. It is assumed that such treatments remove from the protective film formed on the foil by exposure to the atmosphere, certain metal ions whose oxides are more readily penetrated by the ions, Na + and Cl- or Fe(3+) and Cl-, present in the corroding media.
Haney, E. G.↗
Ellipsometric measurements on the passive film prior to the initiation of breakdown in aluminum
The presence of chlorides in aqueous solutions causes pitting attack or stress corrosion cracking in many metals if the oxidation potential is high enough. Results are presented of a series of experiments carried out on 99.99% pure aluminum to determine changes that occur in the ellipsometric parameter of the passive film during incubation period.
Yahalom, J.↗
Research on materials for advanced electronic and aerospace application
Research data are reported on optical and magnetic data processing, hydrogen in metals and stress corrosion phenomena, and polymers and materials at high temperatures and pressures.
Source record↗
Thin-film diffusion brazing of titanium alloys
A thin film diffusion brazing technique for joining titanium alloys by use of a Cu intermediate is described. The method has been characterized in terms of static and dynamic mechanical properties on Ti-6Al-4V alloy. These include tensile, fracture toughness, stress corrosion, shear, corrosion fatigue, mechanical fatigue and acoustic fatigue. Most of the properties of titanium joints formed by thin film diffusion brazing are equal or exceed base metal properties. The advantages of thin film diffusion brazing over solid state diffusion bonding and brazing with conventional braze alloys are discussed. The producibility advantages of this process over others provide the potential for producing high efficiency joints in structural components of titanium alloys for the minimum cost.
Mikus, E. B.↗
Properties of cryogenically worked metals
A program was conducted to determine whether the mechanical properties of cryogenically worked 17-7PH stainless steel are suitable for service from ambient to cryogenic temperatures. It was determined that the stress corrosion resistance of the cryo-worked material is quite adequate for structural service. The tensile properties and fracture toughness at room temperature were comparable to titanium alloy 6Al-4V. However, at cryogenic temperatures, the properties were not sufficient to recommend consideration for structural service.
Schwartzberg, F. R.↗
A film-rupture model of hydrogen-induced, slow crack growth in alpha-beta titanium
The appearance of the terrace like fracture morphology of gaseous hydrogen induced crack growth in acicular alpha-beta titanium alloys is discussed as a function of specimen configuration, magnitude of applied stress intensity, test temperature, and hydrogen pressure. Although the overall appearance of the terrace structure remained essentially unchanged, a distinguishable variation is found in the size of the individual terrace steps, and step size is found to be inversely dependent upon the rate of hydrogen induced slow crack growth. Additionally, this inverse relationship is independent of all the variables investigated. These observations are quantitatively discussed in terms of the formation and growth of a thin hydride film along the alpha-beta boundaries and a qualitative model for hydrogen induced slow crack growth is presented, based on the film-rupture model of stress corrosion cracking.
Nelson, H. G.↗
Space shuttle structural integrity and assessment study
Potential nondestructive evaluation (NDE) requirements for the space shuttle vehicle during structural inspection in the refurbishment/turnaround period, are defined. Data are given on NDE limitations and defect characterization by the process. Special attention was given to the determination of fatigue cracks, stress corrosion cracks, corrosion, and adhesive disbonds of airframes.
Source record↗
A film-rupture model of hydrogen-induced, slow crack growth in acicular alpha-beta titanium
A study has been conducted of the terrace-like fracture morphology of gaseous hydrogen-induced crack growth in acicular alpha-beta titanium alloys in terms of specimen configuration, magnitude of applied stress intensity, test temperature, and hydrogen pressure. Although the overall appearance of the terrace structure remained essentially unchanged, a distinguishable variation is found in the size of the individual terrace steps, and step size is found to be inversely dependent upon the rate of hydrogen-induced slow crack growth. This inverse relationship is independent of all the variables investigated. These observations are quantitatively discussed in terms of the formation and growth of a thin hydride film along the alpha-beta boundaries and a qualitative model for hydrogen-induced slow crack growth is presented, based on the film-rupture model of stress corrosion cracking.
Nelson, H. G.↗