PILOT PRODUCTION AND EVALUATION OF TANTALUM ALLOY SHEET.
Abstract
Pilot quantities of T-222 (Ta-9.6W-2.4Hf-0.01C) sheet were produced from three-inch diameter ingots and evaluated. The T-222 alloy exhibited a significant improvement in elevated temperature mechanical properties over those of the solid solution alloy T-111 (Ta8W-2Hf). The improvement in mechanical properties was achieved with little or no loss of fabricability or weldability. The effect of higher tungsten, hafnium, and carbon concentrations on the properties of T-222 were also investigated. Increasing the solute concentration of T-222 from 12 to 14 per cent at a W-Hf ratio of 4:1, with the standard 0.01 per cent carbon content, produced a slight improvement in the elevated temperature mechanical properties without adversely affecting fabricability or weldability. Increasing the carbon content of T-222 from 0.01 to 0.04 per cent did not produce any significant improvement in elevated temperature mechanical properties; however, the weld-bend transition temperature was raised to above room temperature. Substitution of nitrogen for carbon in T-222 resulted in no gross change in mechanical or weld properties. An investigation of the effect of thermal and mechanical treatments demonstrated that T-222 was susceptible to aging response. The phases responsible were extracted and identified as complex carbides. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1964
- Accession Number
- AD0604173
Entities
People
- R. L. Ammon
- R. T. Begley
Organizations
- Westinghouse Electric Corporation