CREEP--RUPTURE PROPERTIES OF UNALLOYED TANTALUM, Ta--10 PERCENT W AND T-111 ALLOYS.

Abstract

The long-time; high-temperature creep properties of unalloyed tantalum, Ta-10% W, and T-111 (Ta-8% W-2% Hf) were studied at 1204, 1427, and 1649°C (2200, 2600, and 3000°F). The Ta-10% W and T-111 were much stronger than unalloyed t;:mt~J,um.

Ceriantharia (Cnidaria) of the World: an annotated catalogue and key to species

“… Cerianthus lloydii Gosse, 1859: 50; Gosse 1860 : 268–274; Fischer 1874 : 201; M’Intosh 1875 : 38–39; Robertson 1876 : 25, 30; Koren and Danielssen 1877 : 80; Andres 1883 : 554; Hartlaub 1884: 203; Fischer 1887 : 383–384, 432, 437; Carlgren 1893 : 120–123, 133, 148; van Beneden 1897 : 139–140, 142; Fowler 1897 : 806; Haddon 1898 : 401; Gravier 1902 : 592; Gravier 1904 : 259, 267, 276, 278, 280, 288; Roule 1904 : 791–792; Roule 1905 : 83–85; Walton 1908 : 215, 225–226; Torrey and Kleeberger 1909 : 117; Pax 1910 : 166; McMurrich 1910 : 10–11, 17–18; Carlgren 1912a : 11–18; Mello-Leitão 1919 : 36, 39; Gravier 1922 : 88–89; van Beneden 1924 : 101–116, 126, 154; Pax 1928 : 201, 234; Stephenson 1928 : 83–84; Carlgren 1928 : 255–263; Carlgren 1931 : 10; Leloup 1931 : 2, 3, 5–9; Carlgren 1932 : 264–266; Müllegger 1938 : 2, 12, 13; Carlgren 1940 : 9, 10; Carlgren 1942 : 69–71; Nyholm 1943 : 95–140, 193–227; Dons 1945 : 20; Carlgren 1945 : 67–69, 71, 155; Teissier 1950 : 33; Williams 1954 : 52; Füller 1957 : 31; Robins 1969 : 339; Riemann-Zürneck 1969 : 170, 199, 201, 210, 211, 225; Cutress 1961 : 80; Laverack and Blackler 1974 : 28; Manuel 1977 : 484; den Hartog 1977 : 233; Uchida 1979 : 194; Manuel 1981 ...…”

Short term creep rupture predictions for tantalum alloy T-111

“…The most complete study of short term uniaxial creep-rupture behavior for T-111 alloy is that of Stephenson (1967). Creep-rupture data for T-111 alloy in the cold worked condition were obtained at temperatures of 1477, 1700, and 1922 K. The chemical composition of the heat of T-111 used for the tests is shown in Table 1.…”

“…In addition to tr, data for time to 1% strain (tl%) and minimum strain rate (E'rnin)were also plotted for the various tests. Figures 1 and 2 show the data for tr and r-rainfrom Stephenson (1967) which were used for analysis in this study.…”

“…Table 1 compares the chemical compositions of two recent lots of T-111 alloy purchased for RTG fabrication to the T-111 used in the study of Stephenson (1967) and Stoner and Buckman (1970). lt is apparent from inspection of Table 1 that the level of both major alloying elements and trace elements of lots 11 and 12 are indeed comparable to those heats used for creep testing in both of the above studies.…”

“…Using multivariable linear regression analysis procedures (Anderson, 1982), the uniaxial time to rupture data for CW T-111 alloy from Stephenson (1967) were fit to the following power law correlation incorporating stress and temperature: tr(hrs.) = 2.02x 10-2 t_ "5.45 exp(4.475E5/q_T)…”