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Effect of weld micr...
Effect of weld microstructure on brittle fracture initiation in the thermally-aged boiling water reactor pressure vessel head weld metal
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- Hytonen, Noora (author)
- VTT Tech Res Ctr Finland Ltd, Nucl Reactor Mat, Kivimiehentie 3,POB 1000, FI-02044 Espoo, Finland.
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- Que, Zai-qing (author)
- VTT Tech Res Ctr Finland Ltd, Nucl Reactor Mat, Kivimiehentie 3,POB 1000, FI-02044 Espoo, Finland.
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- Arffman, Pentti (author)
- VTT Tech Res Ctr Finland Ltd, Nucl Reactor Mat, Kivimiehentie 3,POB 1000, FI-02044 Espoo, Finland.
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- Lydman, Jari (author)
- VTT Tech Res Ctr Finland Ltd, Nucl Reactor Mat, Kivimiehentie 3,POB 1000, FI-02044 Espoo, Finland.
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- Nevasmaa, Pekka (author)
- VTT Tech Res Ctr Finland Ltd, Nucl Reactor Mat, Kivimiehentie 3,POB 1000, FI-02044 Espoo, Finland.
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- Ehrnsten, Ulla (author)
- VTT Tech Res Ctr Finland Ltd, Nucl Reactor Mat, Kivimiehentie 3,POB 1000, FI-02044 Espoo, Finland.
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- Efsing, Pål, 1965- (author)
- KTH,Hållfasthetslära
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VTT Tech Res Ctr Finland Ltd, Nucl Reactor Mat, Kivimiehentie 3,POB 1000, FI-02044 Espoo, Finland Hållfasthetslära (creator_code:org_t)
- 2021-05-06
- 2021
- English.
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In: International Journal of Minerals, Metallurgy and Materials. - : Springer Nature. - 1674-4799 .- 1869-103X. ; 28:5, s. 867-876
- Related links:
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https://doi.org/10.1...
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https://link.springe...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- Effects of the weld microstructure and inclusions on brittle fracture initiation are investigated in a thermally aged ferritic high-nickel weld of a reactor pressure vessel head from a decommissioned nuclear power plant. As-welded and reheated regions mainly consist of acicular and polygonal ferrite, respectively. Fractographic examination of Charpy V-notch impact toughness specimens reveals large inclusions (0.5-2.5 mu m) at the brittle fracture primary initiation sites. High impact energies were measured for the specimens in which brittle fracture was initiated from a small inclusion or an inclusion away from the V-notch. The density, geometry, and chemical composition of the primary initiation inclusions were investigated. A brittle fracture crack initiates as a microcrack either within the multiphase oxide inclusions or from the de-bonded interfaces between the uncracked inclusions and weld metal matrix. Primary fracture sites can be determined in all the specimens tested in the lower part of the transition curve at and below the 41-J reference impact toughness energy but not above the mentioned value because of the changes in the fracture mechanism and resulting changes in the fracture appearance.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)
Keyword
- reactor pressure vessel
- brittle fracture
- weld microstructure
- thermal aging
Publication and Content Type
- ref (subject category)
- art (subject category)
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