PHYSICAL METALLURGY OF TUNGSTEN AND TUNGSTEN BASE ALLOYS; PART 5
Interim rept. 1 Jun 1963-30 Apr 1964
WESTINGHOUSE ELECTRIC CORP BLOOMFIELD NJ
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Tensile properties of high purity powder metallurgy tungsten and W-1 ThO2 alloy were determined at various strain rates and temperatures 800-2400 C. 1 ThO2 imparts a slight overall increase in strength properties, although above 0.5 T sub m these properties are affected by void formation. The tensile properties of pure W and W-O.35 Ta single crystals worked, and worked and recrystallized investigated from R.T. to 1200C are shown to be affected by C, particularly in the quenched condition. An alloy screening program was conducted with W-25 Re, and 1 ThO2 and 1 HfN additions, and with single crystals of W-3.5 Ta-C. The W-Re alloys have superior strength up to 2400C. A yield stress of 47 kpsi was found at 1600C in the quenched W-3.5 Ta-C single crystal. Reactions between ThO2 and W, C, and several carbides were investigated as was the reaction WTaC. A phase diagram of the W-Ta-C system resulted.
- Metallurgy and Metallography