METASTABLE BETA SHEET ALLOY TI-8MO-8V-2FE-3AL, PART I.
Final technical rept.,
TITANIUM METALS CORP OF AMERICA NEW YORK
Pagination or Media Count:
A 500-lb. ingot of metastable beta alloy Ti-8Mo-8V-2Fe-3Al was melted and mill processed to plate and sheet for evaluation. No processing problems were encountered. Plate samples were evaluated in 2 in and 12 in sections room temp. and 600F smooth and notched tensile properties and K sub ic values were obtained. Samples taken from both sections of plate, when solution treated and aged for 16 hrs. at 900F, had room temp. yield strengths of 190-200Kpsi K sub ic values were 45-48Kpsi-square root of in. Sheets of 0.040 and 0.060 in gage were evaluated by determining 50 and 100 recrystallization parameters, using mill annealed sheet and hot rolled sheet given 25 and 50 cold reduction. Aging response of these materials was then determined at 800-1200F and tensile properties evaluated after selected treatments. From this, 8 conditions of heat treatment were selected for further evaluation by sub-zero and 600F smooth and notched tensile, bend, notched fatigue and K sub ic tests, measurement of creep stability stress corrosion resistance and oxidation characteristics and study of welding behavior. Ti-8Mo-8V-2Fe-3Al possessed good notch tensile strength over the range of -65 to 600F the notched fatigue limit, with a notch configuration of Kt 3.5, was 30-35Kpsi, and the plane strain crack propagation resistance was 45-60Kpsi-square root of in. Creep curves were obtained, employing loads of 90 of the yield strength at 600F, for exposure times of 500 hrs. Author
- Properties of Metals and Alloys