Evaluation Of High Strength Tungsten-Base Alloys

Item

Title
Evaluation Of High Strength Tungsten-Base Alloys
Date
1965
Index Abstract
Not Available
Photo Quality
Complete
Report Number
AFML TR 65-397
Creator
Cook, Charles R.
Corporate Author
TRW Inc.
Laboratory
Air Force Materials Laboratory
Extent
127
Identifier
AD0478443
Access Rights
Export Control
Distribution Classification
1
Contract
AF 33(657)-11239
DoD Project
7351 - Metallic Materials
DoD Task
None Given
DTIC Record Exists
Yes
Distribution Change Authority Correspondence
None
Distribution Conflict
No
Abstract
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.
Report Availability
Full text available
Date Issued
1965-11
Provenance
Lockheed Martin Missiles & Fire Control
Type
report
Format
1 online resource
Media
AFMLTR65-397.pdf