Modeling of grain boundary stresses in Alloy 600

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Corrosive environments combined with high stress levels and susceptible microstructures can cause intergranular stress corrosion cracking (IGSCC) of Alloy 600 components on both primary and secondary sides of pressurized water reactors. One factor affecting the IGSCC is intergranular carbide precipitation controlled by heat treatment of Alloy 600. This study is concerned with analysis of elastic stress fields in vicinity of M{sub 7}C{sub 3} and M{sub 23}C{sub 6} carbides precipitated in the matrix and at a grain boundary triple point. The local stress concentration which can lead to IGSCC initiation was studied using a two-dimensional finite element model. The intergranular precipitates ... continued below

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9 p.

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Kozaczek, K. J.; Sinharoy, A.; Ruud, C. O. & Mcllree, A. R. April 1995.

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Description

Corrosive environments combined with high stress levels and susceptible microstructures can cause intergranular stress corrosion cracking (IGSCC) of Alloy 600 components on both primary and secondary sides of pressurized water reactors. One factor affecting the IGSCC is intergranular carbide precipitation controlled by heat treatment of Alloy 600. This study is concerned with analysis of elastic stress fields in vicinity of M{sub 7}C{sub 3} and M{sub 23}C{sub 6} carbides precipitated in the matrix and at a grain boundary triple point. The local stress concentration which can lead to IGSCC initiation was studied using a two-dimensional finite element model. The intergranular precipitates are more effective stress raisers than the intragranular precipitates. The combination of the elastic property mismatch and the precipitate shape can result in a local stress field substantially different than the macroscopic stress. The maximum local stresses in the vicinity of the intergranular precipitate were almost twice as high as the applied stress.

Physical Description

9 p.

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INIS; OSTI as DE95009033

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  • Joint American Society of Mechanical Engineers (ASME)/Japan Society of Mechanical Engineers (JSME) pressure vessels and piping conference, Honolulu, HI (United States), 23-27 Jul 1995

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  • Other: DE95009033
  • Report No.: CONF-950740--19
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 46569
  • Archival Resource Key: ark:/67531/metadc675115

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • April 1995

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  • July 25, 2015, 2:21 a.m.

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  • Oct. 3, 2017, 6:41 p.m.

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Kozaczek, K. J.; Sinharoy, A.; Ruud, C. O. & Mcllree, A. R. Modeling of grain boundary stresses in Alloy 600, article, April 1995; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc675115/: accessed March 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.