DEVELOPMENT OF DISPERSION STRENGTHENED TUNGSTEN BASE ALLOYS
Summary rept. 1 May 1965-30 Apr 1966
WESTINGHOUSE ELECTRIC CORP BLOOMFIELD NJ LAMP DIV
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The mechanical properties of a W-3.8 vo ThO2 alloy with superior high temperature tensile and creep strength have been determined from room temperature to 3000 C. This alloy has been produced by two separate techniques in rod form. The alloy has been found to exhibit a tensile strength as high as 15,500 PSI at 2400 C and at a strain rate of 10.05 min and a 1 hour creep rupture strength as high as 12,500 PSI at 2200 C. The DBTT of this alloy annealed at 2400 C for 12 hr. is 190 C. Four experimental W-5.7 vo ThO2 alloys have been produced to investigate the effects of chemical processing parameters on dispersoid distribution and strength properties. The high temperature strength properties have been essentially reproduced in alloys in which the thoria dispersion was added to tungsten oxide. In those alloys in which the thoria dispersion was added to the metal powder, the strength improvements were much smaller. A high temperature strength evaluation was also made on W-Re-3.8 vo ThO2 alloys having 5, 10, 15 and 25 wo Re concentration. These alloys have significantly lower strength above 2000 C than the ThDW-WHS W-3.8 vo ThO2 alloy.
- Properties of Metals and Alloys