STP397

    The Relative Stress-Corrosion Susceptibility of Titanium Alloys in the Presence of Hot Salt

    Published: Jan 1966


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    Abstract

    Steady-state stress-corrosion tests at elevated temperature were performed on three titanium alloys. Mill annealed titanium 6Al-4V was the least susceptible, followed in order of increasing susceptibility by titanium 8Al-1Mo-1V and titanium 6Al-6V-2Sn. Sodium chloride was more detrimental than ASTM synthetic salt. Extensive tests were conducted on duplex annealed titanium 8Al-1Mo-1V. Cyclic state testing of this alloy indicated an absence of stress-corrosion cracking and demonstrated that the time at temperature below the maximum operating temperature of a supersonic aircraft might be an important variable. Exposure tests on brake-formed, stress-relieved titanium 8Al-1Mo-1V sheet specimens indicated a deteriorating effect distinct from stress-corrosion cracking. Fatigue crack growth and fracture toughness determinations indicated no embrittling effects in titanium 8Al-1Mo-1V exposed to hot salt in the absence of stress.

    Keywords:

    titanium alloys, stress corrosion, stress-corrosion tests, salt water, sodium chloride, thermal cyclings, high-temperature tests


    Author Information:

    Piper, D. E.
    Research engineers, The Boeing Co., Seattle, Wash.

    Fager, D. N.
    Research engineers, The Boeing Co., Seattle, Wash.


    Paper ID: STP46426S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP46426S


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