TANTALUM EXTRUSION PROGRAM. Second Interim Technical Report, April 10, 1961-August 24, 1961

Technical Report · Wed Oct 31 04:00:00 EST 1962

OSTI ID:4798231

Five different starting materials were used to evaluate the vacuum arc melting and electron beam melting parameters to determine optimum consolidation procedures. The most promising method for the production of sound extrusion billets was a three-step melting process. This consisted of vacuum arc melting 2.5-inch diameter presintered sodium-reduced Ta--10% W electrodes into a 5-inch diameter crucible. This material was then electron beam melted to insure maximum purity in the ingot. The electrode for the third melt consisted of two welded 5- inch diameter electron beam melted ingots. This electrode was vacuum arc melted into an 8-inch diameter ingot. One cast and seven wrought Ta--l0% W billets were produced from electron-beam ingots and extruded at temperatures between 3150 and 3650 deg F and at extrusion reductions of 11.8: 1 and 17.3: 1. It appears that extrusion temperatures above 3650 deg F are required to make the desired Tee shape (17.3: 1 reduction) from a 3 7/8-inch diameter liner. The extrusion constant at 3650 deg F is approximately 70,000 psi. In the initial extrusion, the data obtained were not adequate to determine any significant difference between cast and wrought material. (auth)

• Research Organization: Wah Chang Corp., Albany, Ore. Page(s): 71
• NSA Number: NSA-16-009171
• OSTI ID: 4798231
• Report Number(s): NP-11284
• Country of Publication: United States
• Language: English

Related Subjects

CASTING
ELECTRICITY
ELECTRON BEAMS
EXTRUSION
HIGH TEMPERATURE
IMPURITIES
MELTING
METALS, CERAMICS, AND OTHER MATERIALS
SINTERING
SODIUM
TANTALUM
TANTALUM ALLOYS
TUNGSTEN ALLOYS
VACUUM