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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.
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Chemical reaction mechanism of stress corrosion cracking of titanium alloys exposed to liquid nitrogen tetroxide
Failure of boot fitting from cracking and stress corrosion
Role of moisture and hydrogen in hot salt stress corrosion cracking of titanium alloys
Contributions of NASA sponsored programs dealing with electroforming, Ni-Cd-Zn-Ag batteries, refractory alloys, fuel cells, solar cells, and stress corrosion in titanium alloys
Biaxial creep behavior of tantalum alloy tubing and stress corrosion by potassium
Structural modes of fracture, analyzing brittle, ductile, fatigue and stress corrosion fractures using fractography
Hydrogen embrittlement mechanism in steel based on modified pressure theory, discussing crack propagation mechanisms and stress corrosion cracking
Moisture and hydrogen role in hot chloride salt stress corrosion cracking of Ti alloys by radiotracer technique and mass spectrography
Titanium alloys hot salt stress corrosion cracking, studying effects of chlorides and surface oxides
Fabrication methods and tests for salt-stress corrosion and elevated temperature effects on compressive strength of titanium alloy skin stringer panels
Materials technology for reuse capability of space shuttle, discussing normal and stress corrosion, hydrogen embrittlement and flammability
Titanium hydride deformation assisted nucleation in alpha-beta titanium alloy, showing low strain rate embrittlement and stress corrosion crack propagation in aqueous environments
Stress corrosion cracking of Ti alloys in nitrogen tetroxide and methyl alcohol environments in Apollo spacecraft pressure vessels
Reactions between liquid dinitrogen tetraoxide and titanium alloy that result in stress corrosion cracking
Method and apparatus for inducing compressive stresses in pressure vessel to prevent stress corrosion
Methanol stress corrosion cracking of Ti-Al-V foil inhibited by pretreatment in aqueous solutions of electrolytes, discussing colloidal character of microcrystallites
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.
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.