Measurement of the Fundamental Parameters for the Film-Rupture/Oxidation Mechanism

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Identification of the mechanism responsible for primary water stress corrosion cracking (PWSCC) in nickel-base alloys is a controversial topic. Numerous mechanisms, including the film-rupture/oxidation (i.e., slip-oxidation or slip-dissolution) mechanism, have been proposed to explain PWSCC. According to this mechanism, the observed sensitivity of PWSCC to material and environmental factors may be explained by the combined effects of repassivation kinetics, oxide rupture strain, and crack tip strain rate (which includes creep). Previous research has shown that increasing the Cr content of Ni-9%Fe-Cr from 16 to 30 wt% strongly decreases PWSCC susceptibility. Consequently, measurements of these three fundamental parameters (repassivation, oxide rupture, ... continued below

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9 p.

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Attanasio, S.A.; Fish, J.S.; Morton, D.S.; Rosecrans, P.M.; Was, G.S.; Wilkening, W.W. et al. April 23, 1999.

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Identification of the mechanism responsible for primary water stress corrosion cracking (PWSCC) in nickel-base alloys is a controversial topic. Numerous mechanisms, including the film-rupture/oxidation (i.e., slip-oxidation or slip-dissolution) mechanism, have been proposed to explain PWSCC. According to this mechanism, the observed sensitivity of PWSCC to material and environmental factors may be explained by the combined effects of repassivation kinetics, oxide rupture strain, and crack tip strain rate (which includes creep). Previous research has shown that increasing the Cr content of Ni-9%Fe-Cr from 16 to 30 wt% strongly decreases PWSCC susceptibility. Consequently, measurements of these three fundamental parameters (repassivation, oxide rupture, and creep) were performed as a function of Cr content, and SCC crack growth rates were predicted on the basis of the resulting data. This paper illustrates that considering these three parameters concurrently may contribute to the understanding of Cr effects on PWSCC of Ni-base alloys. However, it is not clear whether the film-rupture/oxidation mechanism can adequately predict the observed crack growth rates for Alloy 600 at 338 C.

Physical Description

9 p.

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OSTI as DE00008233

Medium: P; Size: 9 pages

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  • 9th International Symposium on Environmental Degradation of Materials in Nuclear Power Systems, Newport Beach, CA (US), 08/01/1999

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  • Report No.: KAPL-P-000215
  • Grant Number: AC12-76SN00052
  • Office of Scientific & Technical Information Report Number: 8233
  • Archival Resource Key: ark:/67531/metadc784997

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  • April 23, 1999

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  • Dec. 3, 2015, 9:30 a.m.

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  • April 11, 2017, 8:27 p.m.

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Attanasio, S.A.; Fish, J.S.; Morton, D.S.; Rosecrans, P.M.; Was, G.S.; Wilkening, W.W. et al. Measurement of the Fundamental Parameters for the Film-Rupture/Oxidation Mechanism, article, April 23, 1999; United States. (digital.library.unt.edu/ark:/67531/metadc784997/: accessed June 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.