High Toughness Titanium Alloy Development.
Final engineering rept. Jan 75-May 76,
ROCKWELL INTERNATIONAL LOS ANGELES CALIF LOS ANGELES AIRCRAFT DIV
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This is the final engineering report for a Naval Air Systems Command sponsored program to evaluate the forgeability characteristics of CORONA-5, a new titanium alloy with a nominal composition of Ti-4.5Al-5Mo-1.5Cr. The goal of this contract was to define forging and final heat treat parameters which would produce optimum or near-optimum toughness over the strength range of 130-140 ksi about 900-965 MPa, UTS. During this program, a total of six different forging sequences were evaluated to identify effects of varying degrees of alphabeta working on resultant microstructures and attendant mechanical properties. In addition, two different final heat treat cycles were employed to provide strength variations over the goal range. The results of these evaluations indicated that the best combinations of strength and toughness were produced by forging the material above its beta transus or at temperatures high in the alpha plus beta region.
- Metallurgy and Metallography