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The stress-corrosion of Ti-6Al-4V titanium alloy in nitrogen tetroxide was investigated by using small laboratory-size self -stressed specimens and tanks. Tests were conducted from 65° F to 165° F (290° K to 345° K) for purposes of determining the time for crack initiation. At 165° F (345° K) the cracking was severe and resulted in failures within 4 hours exposure, the damage diminishing rapidly with decreasing temperature. At 75° F (295° K), no stress-corrosion damage was observed for exposures up to 500 hours. Stress levels from 25 to 100 ksi (170 to 690 MN/m2) were investigated and crack initiation was observed at all stress levels in approximately the same time. An excellent correlation was obtained between crack initiation time on laboratory specimens and failure time for tanks.--P. [1].
Factors affecting stress-corrosion cracking of Ti-6Al-4V alloy in methanol.
The report was prepared to document the recent finding that the Ti-6Al-4V alloy is susceptible to stress-corrosion cracking in some grades of nitrogen tetroxide, and to describe briefly the work that is now going on to define the critical parameters involved in this phenomenon. Previously titanium and its alloys were believed to be compatible with nitrogen tetroxide. In the absence of stress, titanium shows almost no corrosion in liquid or gaseous nitrogen tetroxide in tests to 165 deg F. Although titanium is impact sensitive at high impact levels, no propagation of the reaction is reported.
Salt stress corrosion cracking effects on tensile and stress rupture properties of titanium alloy sheet.