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Evaluation Of High Strength Tungsten-Base Alloys

Report Number: AFML TR 65-397
Author: Cook, Charles R.
Corporate Author: TRW Inc.
Laboratory: Air Force Materials Laboratory
Date of Publication: 1965-11
Pages: 127
Contract: AF 33(657)-11239
Project: 7351 - Metallic Materials
AD Number: AD0478443

A deformation study and evaluation of high strength tungsten base alloys was accomplished. The two alloys studied included the solid solution strengthened 68% W-20% Ta-12% Mo alloy and the dispersed phase strengthened W- 12% Cb-0.29% V-0. 12% Zr-0.07% C alloy. The vacuum melting plus centrifugal casting technique was used for the consolidation of the solid solution alloy. A new type of ingot mold was developed to cast 3-inch diameter ingots. High temperature extrusion was successfully accomplished to provide 68% W-20% Ta-12% Mo bar for evaluation. Studies of upset and side forging, rolling and swaging of the solid solution alloy were made. Upset forging was the only successful technique for secondary working. The extruded bar was used to determine recrystallization behavior, tensile and creep rupture properties. The one-hour recrystallization temperature for the 68% W-20% Ta-12% Mo bar was 3300 F. The 3000 F, 3500 F and 4000 F tensile strengths of the recrystallized bar were approximately three times those of unalloyed tungsten. The W-12% Cb-(V, Zr, C) alloy was consolidated by AC arc melting due to arc instability in DC melting. The three-inch diameter ingots could not be produced without cracking. High temperature extrusion produced sufficient sound bar to evaluate tensile properties. This dispersed phase strengthened alloy exhibited the highest strengths at elevated temperatures known to have been reported to date for refractory metals.

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