875 Welded Components

Welding generally increases strength and hardness and decreases ductility [12]. Welds in unalloyed titanium grades 1, 2, and 3 do not require postweld treatment unless the materials will be highly stressed in a strongly reducing atmosphere [26]. Welding of the a class of alloys and leaner a-P alloys such as Ti-6Al-4V can be accomplished with relative ease. Welds in more P-rich a-P alloys such as Ti-6Al-6V-2Sn have a high likelihood of fracturing with little or no plastic straining. Weld ductility can be improved by postweld heat treatment consisting of slow cooling from a high annealing temperature. And at the other end of the spectrum rich P-stabilized alloys can be welded, and such welds exhibit good

TABLE 8.12 Mechanical Properties of Titanium Metal Matrix Composites

System

UTS (MPa) L

UTS (MPa) T

E (GPa) L

Ti-6Al-4V

0 0

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