The relationship between observed stress corrosion cracking fracture morphology and microstructure in Alloy 600

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Description

Microstructure is known to influence the stress corrosion cracking (SCC) behavior of Alloy 600 in both hydrogenated water and steam environments. This study evaluated the relative SCC response of a single heat of Alloy 600 as a function of microstructure in a hydrogenated doped-steam environment. The 400 C doped-steam environment was selected for the SCC tests to accelerate cracking. The material was evaluated in three conditions: (1) as-received (2) as-annealed, and (3) as-annealed + 26% deformation. Microstructural characterization was performed using analytical electron microscopy (AEM) techniques for the evaluation of carbide type and morphology, and general structure. Constant displacement (bolt-loaded) ... continued below

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13 p.

Creation Information

Symons, D.M.; Burke, M.G. & Foster, J.P. December 31, 1997.

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Authors

  • Symons, D.M.
  • Burke, M.G. Bettis Atomic Power Lab., West Mifflin, PA (United States)
  • Foster, J.P. Westinghouse Electric Corp., Pittsburgh, PA (United States). Westinghouse Science and Technology Center

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  • Bettis Atomic Power Laboratory
    Publisher Info: Bettis Atomic Power Lab., West Mifflin, PA (United States)
    Place of Publication: West Mifflin, Pennsylvania

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Description

Microstructure is known to influence the stress corrosion cracking (SCC) behavior of Alloy 600 in both hydrogenated water and steam environments. This study evaluated the relative SCC response of a single heat of Alloy 600 as a function of microstructure in a hydrogenated doped-steam environment. The 400 C doped-steam environment was selected for the SCC tests to accelerate cracking. The material was evaluated in three conditions: (1) as-received (2) as-annealed, and (3) as-annealed + 26% deformation. Microstructural characterization was performed using analytical electron microscopy (AEM) techniques for the evaluation of carbide type and morphology, and general structure. Constant displacement (bolt-loaded) compact tension specimens were used to induce SCC. The as-annealed and as-annealed plus cold worked samples had two fracture morphologies: a rough intergranular SCC fracture morphology and a smooth intergranular fracture morphology. The SCC fracture in the as-received specimens was characterized by a classic intergranular morphology at low magnification, consistent with the microstructural evaluation of cross-sectional metallographic samples. More detailed examination revealed a pseudo-intergranular fracture morphology. This pseudo-intergranular morphology appears to be comprised of very fine cleavage-like microfacets. These observations may assist in understanding the difference in SCC fracture morphologies as reported in the open literature.

Physical Description

13 p.

Notes

INIS; OSTI as DE99000483

Source

  • 8. international symposium on environmental degradation of materials in nuclear power systems-water reactors, Amelia Island, FL (United States), 10-14 Aug 1997

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  • Other: DE99000483
  • Report No.: WAPD-T--3130
  • Report No.: CONF-970832--
  • Grant Number: AC11-93PN38195
  • DOI: 10.2172/291121 | External Link
  • Office of Scientific & Technical Information Report Number: 291121
  • Archival Resource Key: ark:/67531/metadc681994

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Creation Date

  • December 31, 1997

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

Description Last Updated

  • May 16, 2016, 6:30 p.m.

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Symons, D.M.; Burke, M.G. & Foster, J.P. The relationship between observed stress corrosion cracking fracture morphology and microstructure in Alloy 600, report, December 31, 1997; West Mifflin, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc681994/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.