PILOT PRODUCTION AND EVALUATION OF TANTALUM ALLOY SHEET. Summary Phase Report, April 15, 1962 to March 15, 1963

Technical Report · Sat Jun 15 04:00:00 EDT 1963

OSTI ID:4648907

Ammon, R L; Begley, R T

Studies of the processing and properties of tantalumrich alloys in the Ta--W-- Hf system were carried out. Procedures for the production of pilot quantities of low interstitial T-111 (Ta-- 8W--2Hf) sheet from 3-in. diameter ingots were developed, and detailed evaluations of mechanical and physical properties were conducted. The effects of intentional additions of interstitial elements, carbon, oxygen, and nitrogen, on fabricability, weldability, and mechanical properties of T-111 were investigated. Limited amounts of carbon and nitrogen improved mechanical properties while oxygen had little or no effect. Interstitial additions on the order 0.03 wt% had no adverse effect on fabricability or weldability. The determination of the optimum composition of T- 111 with respect to the substitutional solutes, tungsten and hafnium, consistent with good fabricability, weldability, and high temperature strength is described. Results indicated that a minimum in weld bend transition temperature occurs at a tungsten-hafnium ratio of 4: 1, permitting the total solute concentration of T- 111 to be raised to 14 wt% without adversely affecting the fabricability and weldability, while resulting in a significant increase in the high temperature tensile properties. Limited studies of the weldability and mechanical properties of Ta--W--Re, Ta-W--Hf--V, and Ta--W-Hf--Re alloys were also carried out. (auth)

• Research Organization: Westinghouse Electric Corp. Astronuclear Lab., Pittsburgh
• NSA Number: NSA-17-034420
• OSTI ID: 4648907
• Report Number(s): WANL-PR-M-004; AD-409896
• Country of Publication: United States
• Language: English

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