VACUUM ARC MELTING OF A TUNGSTEN ALLOY (TUNGSTEN-MOLYBDENUM-COLUMBIUM)
A satisfactory melting technique was established for the production of fine-grained, homogeneous, high quality, tungsten base alloy ingots. The 88%W-- 6%Mo--6%Nb alloy originally selected for the program was discarded because of ingot cracking and replaced by a 92%W --6%Mo--2%Nb alloy. The reduction of Nb from 6 to 2% permitted ingots, 6 to 9 in. in length. Macroexamination revealed a mixture of fine, equiaxed grains and short, thin columnar grains. Seven ingots of the 92%W--6%Mo--2%Nb composition were extruded successfully at 4000 deg F, using ratios of 4.4 : 1, 5.7 : 1, and 7.5 : 1. The extruded material was forged and rolled to determine workability. A time, temperature, recrystallization study was conducted on forged specimens of the 92%W--6%Mo--2%Nb alloy. (auth)
- Research Organization:
- Westinghouse Electric Corp., Blairsville, Penna)
- NSA Number:
- NSA-17-006592
- OSTI ID:
- 4763165
- Report Number(s):
- ASD-TDR-62-781
- Country of Publication:
- United States
- Language:
- English
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