RESEARCH ON WORKABLE REFRACTORY ALLOYS OF TUNGSTEN, TANTALUM, MOLYBDENUM, AND COLUMBIUM
Tungsten- and tantalum-rich alloys of the W-Ta-MoNb system were studied for high-strength structural applications above 2500 deg F. Twenty specific compositions, including binary, ternary, and quaternary alloys were investigated. Several homogeneous and contamination-free ingots of each alloy were melted by use of a specially designed comsumable-electrode vacuum-arc melting unit. Special techniques were developed for the impact extrusion of the alloys, and all alloys were successfully extruded at 2500 to 4000 deg F. Creep and tension tests were conducted on the as-extruded samples at 3000 deg F in vacuum. The hightemperature strength of the tungsten-rich alloys was increased considerably by the addition of columbium, and the high-temperature strength of the tantalum- rich alloys was appreciably increased by additions of molybdenum and tangsten. One alloy (88.6 W-5.7 Mo-5.7 Nb) had a tensile strength of 62,000 psi at 3000 deg F; several other alloys had tensile strengths in excess of 50,000 psi. The strengths were attained by a combination of solid-solution strengthening and strain hardening. On the basis of results of the investigation, the tungsten- and tantalum-rich alloys of the W-Ta-Mo-Nb system offer excellent promise as wrought materials for structural applications at very high temperatures. (auth)
- Research Organization:
- Crucible Steel Co. of America, Pittsburgh
- NSA Number:
- NSA-15-028049
- OSTI ID:
- 4841688
- Report Number(s):
- WADD-TR-61-134
- Country of Publication:
- United States
- Language:
- English
Similar Records
RESEARCH ON REFRACTORY ALLOYS OF TUNGSTEN, TANTALUM, MOLYBDENUM, AND COLUMBIUM. Quarterly Progress Report No. 3
DEVELOPMENT OF COBALT-BASE ALLOYS. Quarterly Report No. 1 for December 15, 1958-March 31, 1959
Related Subjects
DEFORMATION
EFFICIENCY
ELECTRIC ARCS
ELECTRODES
EXTRUSION
HIGH TEMPERATURE
HOT WORKING
IMPURITIES
MATERIALS TESTING
MELTING
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM ALLOYS
NIOBIUM ALLOYS
PHASE DIAGRAMS
PLANNING
PRESSURE
REFRACTORIES
RODS
SAMPLING
SOLID SOLUTIONS
STRESSES
TANTALUM ALLOYS
TEMPERING
TENSILE PROPERTIES
TUNGSTEN ALLOYS
USES
VACUUM