FRACTURE TOUGHNESS CHARACTERISTICS OF SOME TITANIUM ALLOYS FOR DEEP- DIVING VEHICLES
NAVAL RESEARCH LAB WASHINGTON DC
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The notch-fracture-toughness characteristics of a wide variety of titanium alloy plate are being investigated to provide alloy selection design and specification criteria for the use of titanium alloys as hull-materials for deep-diving submarines and other structural applications. The relationships between various standard and newly developed fracture-toughness tests have been established for one-inch thick rolled plate, and the results from these tests have been correlated to the performance of the material in a structural prototype element test. A preliminary fracture diagram is presented for titanium which relates fracture toughness to strength level and the performance of the material in the structural prototype element test in the presence of flaws. The optimum materials trend line has been established, which indicates the maximum strength level for any given level of toughness. The fracture toughness characteristics of a number of titanium alloys and their relationship to the optimum materials trend line have been delineated. Results of the alloy development and processing investigation provide useful guidelines for optimization of strength and toughness of titanium alloys.
- Metallurgy and Metallography
- Submarine Engineering