Abstract
The tensile properties and fracture toughness levels found in forged and heat treated pancake forgings of the high strength titanium alloy, Ti6Al2Sn4Zr6Mo, were analyzed as to their relationship to microstructural features. The desired microstructure for the alloy, resulting in an optimum combination of both fracture toughness and tensile ductility at yield strengths of 170–180 k.s.i., is described as containing about 10 volume percent equiaxed or globular alpha (primary alpha) along with a matrix containing relatively coarse acicular alpha (secondary alpha) and aged beta. Although many combinations of forging procedures and/or heat treatments may exist which result in material having the above-described microstructure, two specific approaches for its attainment were investigated. One consisted of forging very high (1725°F) in the two-phase region, followed by a low (1525°F) temperature solution treatment; the other consisted of alpha+beta forging at a convenient temperature, followed by two solutions treatments. Aging to a desired strength level was the final step in each operation.
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