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Research On Workable Refractory Alloys Of Tungsten, Tantalum, Molybdenum, And Columbium

Report Number: WADD TR 61-134 Part 2
Author(s): Westgren R. C.; Thompson, V. R.; Petersen, V. C.
Corporate Author: Crucible Steel Company Of America
Laboratory: Directorate of Materials and Processes
Date of Publication: 1963-04
Pages: 107
Contract: AF 33(616)-8135
Project: 7351 - Metallic Materials
Task: 735101
AD Number: AD0407690

Abstract:
Under a previous contract, the W-Ta-Mo-Cb alloy system was investigated, and several tungsten- and tantalum-rich alloys were developed and evaluated in the form of extruded bars. Many of these alloys exhibited very high strengths at 3000°F; in fact, the tensile strengths of some alloys were in excess of 60,000 psi. The present work was a continuation of this effort and was aimed at producing and evaluating alloys from the W-Ta-Mo-Cb system in the form of sheet (Phase I) and increasing its high-temperature strength by the formation of dispersed carbides (Phase II).

For Phase I, small cylindrical ingots of six selected alloys and unalloyed tungsten were consumably vacuum arc-melted by a multiple electrode technique and successfully extruded to sheet bars. Two alloys and unalloyed tungsten were rolled to sheet and recrystallization temperatures, bend transition temperatures, and high- temperature tensile properties were determined. The other four alloys could not be rolled to sheet by the techniques attempted in this program.

Experiments under Phase II resulted in the development of a successful technique for consumably vacuum arc melting 88W-12Cb alloys that contained small amounts of vanadium, zirconium, and carbon. These alloys showed 3500°F tensile strengths at 49,000 to 57,000 psi--this constituted a twofold increase in strength above that of the base solid solution composition.

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