RESEARCH ON WORKABLE REFRACTORY ALLOYS OF TUNGSTEN, TANTALUM, MOLYBDENUM, AND COLUMBIUM
Abstract
The W-Ta-Mo-Cb alloy system was previously investigated, and several tungsten- and tantalumrich alloys were developed and evaluated in the form of extruded bars. Many of these alloys exhibited very high strengths at 3000 F. Effort 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 consumable 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. 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 vanacium, zirconium, and carbon. These alloys showed 2500 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1963
- Accession Number
- AD0407690
Entities
People
- V. C. Petersen
- V. R. Thompson