SEDL / STP / STP397-EB / STP46427S

Environmental Effects Studies on Selected Titanium Alloys

Simenz, R. F.
Research specialists and group research and development engineer, Lockheed-California Co., Burbank, Calif.

Orden, J. M. Van
Research specialists and group research and development engineer, Lockheed-California Co., Burbank, Calif.

Wald, G. G.
Research specialists and group research and development engineer, Lockheed-California Co., Burbank, Calif.

Pages: 27    Published: Jan 1966

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Abstract

The elevated temperature stress-corrosion cracking behavior of several titanium alloys was investigated. The results indicate varying degrees of susceptibility, depending on alloy, test conditions, heat treatment, and so on. The need for additional work and refinement and standardization of test conditions is evident from the variations in test results reported here and by other researchers. Materials tested included sheet alloys Ti-8Al-1Mo-1V, Ti-6Al-4V, Ti-5Al-2.5Sn, Ti-13V-11Cr-3Al, Ti-4Al-3Mo-1V, and extrusion alloys Ti-8Al-1Mo-1V, Ti-6Al-6V-2Sn, Ti-6Al-4V, and Ti-7Al-4Mo. Test exposure temperatures from 500 to 650 F were used. Other test variables were salt type and thickness, heat treatment strength level, stress level, fabrication effects (spotwelding, fusion welding, bend forming, and so on) and exposure time. It has not been established whether laboratory stress-corrosion behavior in titanium alloys can be a problem in actual service; however, the approach at Lockheed will be to select and control materials for use in SST construction which are shown to be unaffected in laboratory elevated temperature stress-corrosion testing.