Creep properties of PWC-11 base metal and weldments as affected by heat treatment

Conference · Thu Sep 01 00:00:00 EDT 1994

OSTI ID:10181379

Titran, R H; Moore, T J; Grobstein, T L ^[1]

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1. Lewis Research Center, Cleveland, OH (United States)

In a preliminary study using single specimens for each condition, PWC-11 (a niobium-base alloy with a nominal composition of Nb-1%Zr-0.1%C) was creep tested at 1350 K and 40 MPa. Base metal specimens and specimens with transverse electrode beam welds were tested with and without a 1000 hr, 1350 K aging treatment prior to testing. In the annealed condition (1 hr at 1755 K + 2 hr at 1475 K), the base metal exhibited superior creep strength compared to the aged condition, reaching 1 percent strain in 3480 hr. A 1000 hr, 1350 K aging treatment prior to creep testing had a severe detrimental effect on creep strength of the base metal and transverse electron beam weldments, reducing the time to attain 1 percent strain by an order of magnitude. Extrapolated temperature compensated creep rates indicate that the present heat of PWC-11 may be four times as creep resistance as similarly tested Nb-1%Zr. The extrapolated stress to achieve 1 percent creep strain in 7 yr at 1350 K is 0.6 MPa for annealed Nb-1%Zr and 2.8 MPa for annealed and aged PWC-11 base metal with and without a transverse electron beam weld.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
• Sponsoring Organization: National Aeronautics and Space Administration, Washington, DC (United States); USDOE, Washington, DC (United States)
• DOE Contract Number: AI03-86SF16310
• OSTI ID: 10181379
• Report Number(s): NASA-TM-88842; CONF-8603231-1; ON: DE94051240; TRN: 94:008342
• Resource Relation: Conference: TMS-AIME annual meeting on alternate alloying for environmental resistance,New Orleans, LA (United States),2-6 Mar 1986; Other Information: PBD: [1994]
• Country of Publication: United States
• Language: English

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36 MATERIALS SCIENCE
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NIOBIUM ALLOYS
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