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Stress-corrosion cracking of a uranium 6-weight percent niobium alloy [electronic resource].

Published:
Washington, D.C : United States. Energy Research and Development Administration, 1976.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
Pages: 18 : digital, PDF file
Additional Creators:
North American Aviation. Atomics International Division, United States. Energy Research and Development Administration, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
The stress-corrosion cracking (SCC) behavior of U--6 wt percent Nb in three different heat-treated conditions was investigated. The three heat treatments were: (a) solution quenched (the nonaged condition); (b) solution quenched and aged 6 hours at 250/sup 0/C (the underaged condition); and (c) solution quenched and aged 80 minutes at 600/sup 0/C (the overaged condition). The SCC tests utilized smooth, dead-weight loaded, static tensile specimens exposed to nitrogen-saturated or oxygen-saturated water containing 50 ppM chloride ions. The alloy in the solution-quenched condition was not susceptible to SCC when loaded to 90 percent of yield strength in either the oxygen or nitrogen-saturated chloride solutions. The underaged material (6 hours at 250/sup 0/C) was susceptible to SCC in oxygen or nitrogen-saturated water containing 50 ppM chloride ions. The underaged material was more susceptible to cracking in the oxygen-saturated solution than in the nitrogen-saturated solutions. The SCC in the underaged material proceeded by a principally intercrystalline fracture mode with the overload condition being principally transgranular. The overaged material also exhibited SCC, but to a lesser extent than the underaged material. Here again, cracking was more pronounced in the oxygen-saturated solution than in the nitrogen-saturated solution. The overaged material fractured by a combined SCC mode and mechanical-cracking mode, i.e., stress-corrosion cracks were growing at the same time corrosion was reducing the cross-sectional area of the specimen. The importance of knowing alloy characteristics relates to considerations of design, environmental behavior, and economics.
Report Numbers:
E 1.99:rfp-2429
rfp-2429
Subject(s):
Other Subject(s):
Note:
Published through SciTech Connect.
05/29/1976.
"rfp-2429"
Mah, R.; Jackson, R. J.; Kochen, R. L.
Funding Information:
AT(29-1)-1106
View MARC record | catkey: 14459607