DEVELOPMENT OF A STABLE-BETA TITANIUM ALLOY.
Quarterly rept. no. 9, 1 Jul-30 Sep 64,
TITANIUM METALS CORP OF AMERICA NEW YORK
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An X-ray examination of Ti-17V-10Cr-3Al-1Si revealed the presence of alpha and Ti5Si3 lines in a sample quenched from 2050F and aged at 1250F. No hardening response upon aging at 1250F was found in Ti-17V-10Cr-3Al-2Ge. Room temperature tensile tests upon ageable beta alloy Ti-17V-2Fe-2Co-3Al indicated that a yield strength of 180,000 psi was reached after aging for 8 hours at 900F aging for 24 hours at 800-900F produced yield strengths exceeding 200,000 psi. Creep tests on Ti-8Mo-8V-2Fe3Al showed that, when aged at 900F for 8 hours, after 500 hours exposure at 600F, under a load of 128,000 psi, deformations did not exceed 0.43. Ti-17V-4Fe-3Al, exposed under similar conditions, showed creep deformations of 2. Oxidation and stress corrosion tests on the above alloys indicated that Ti-8Mo-8V-2Fe-3Al was the superior alloy. Weldability tests on ageable beta alloys suggested their performance was similar to the commerical alloy Ti-13V-11Cr-3Al, whereas the two stable-beta alloys Ti-17V-10Mn-3Al and Ti-8Mo-8V-6Fe-3Al had poor weldability relative to Ti-13V-11Cr-3Al. Tests on overaging ageable beta alloy Ti-17V-7.5Co-3Al showed that little increase in hardness over that of the solution treated condition occurred upon aging at 1100F for up to 16 hours. Author