Accession Number:

AD0423841

Title:

PHYSICAL METALLURGY OF TUNGSTEN AND TUNGSTEN BASE ALLOYS.

Descriptive Note:

Interim rept., 1 June 62-30 Apr 63,

Corporate Author:

WESTINGHOUSE ELECTRIC CORP BLOOMFIELD N J

Personal Author(s):

• Sell,Heinz G.
• Keith,George H.
• Schnitzel,Randolph H.
• Cerulli,N. Francis

Report Date:

1963-05-01

Pagination or Media Count:

103.0

Abstract:

The strength properties of W-TaC, W-Ta2O5, W-ThO2 and W-C carburizedalloys were investigated at and below 1650 C. Carbides and oxides stabilize the worked stress relieved structure to higher temperature and strenghtening appears to be due primarily to work hardening. Recrystallized, the alloys, in general, are not stronger than pure tungsten. The tensile properties of single and worked single crystals of W-.25 Ta were studied from R.T. to 1600 C for a variety of conditions. The combined effect of both alloying and grain boundaries on strength was determined to be about 10,000 psi from 300 to 1600 C. Carburizing, heat treating and quenching has a large effect on the yield stress of W-.25 Ta single crystal betwe n 300 and 1000 C. The effectiveness of a pack carburizing technique was evaluated by autoradiography. Also studied was the chemical stability of TaC and ThO2 in W. TaC decarburizes readily above 2000 C and is easily reduced by WO3 below 1000 C. ThO2 is more stable up to 2650 C. Author

Descriptors:

• HIGH TEMPERATURE
• POWDER METALLURGY
• EXTRUSION
• OXIDES
• CARBIDES
• EXPERIMENTAL DATA
• DUCTILITY
• TANTALUM ALLOYS
• NIOBIUM ALLOYS
• HARDNESS
• X RAY DIFFRACTION
• RADIOGRAPHY

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE