DYNAMIC SUBCRITICAL CRACK GROWTH PROPERTIES OF DUPLEX ANNEALED TI-8AL-1MO-1V AND MILL ANNEALED TI-6AL-4V IN AN AIR AND CORROSIVE ENVIRONMENT
Final rept. Jul 1965-Mar 1966
DAYTON UNIV OH RESEARCH INST
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This program was conducted to determine the dynamic fatigue crack growth properties of two titanium alloys Ti-8Al-1Mo-1V Duplex Annealed and Ti-6Al-4V Mill Annealed at room temperature in an air and in a 3.5 percent NaCl environment. Dynamic crack growth versus cycles to failure was determined at two loading frequencies 40 cpm and 2 cpm for the corrosive environment and at a 40 cpm loading frequency for the air environment. A comparison of the air and corrosive environment test data at the 40 cpm loading frequency shows a reduction in cyclic life when exposed to the 3.5 percent NaCl environment. Also a comparison of the corrosive environment test data at loading frequencies of 40 cpm and 2 cpm shows a reduction in cyclic life on both a time and a number of cycles to failure basis at the higher loading frequency.
- Metallurgy and Metallography