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Experimental and theoretical investigation of three Alloy 690 mockup components: Base metal and welding induced changes
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).ORCID iD: 0000-0002-2641-7838
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Computational Thermodynamics.ORCID iD: 0000-0002-3283-0549
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).ORCID iD: 0000-0003-1498-5691
2014 (English)In: International Journal of Nuclear Energy, ISSN 2314-6060, Vol. 2014Article in journal (Refereed) Published
Abstract [en]

The stress corrosion cracking (SCC) resistance of cold deformed thermally treated (TT) Alloy 690 has been questioned in recent years. As a step towards understanding its relevancy for weld deformed Alloy 690 in operating plants, Alloy 690 base metal and heat affected zone (HAZ) microstructures of three mockup components have been studied. All mockups were manufactured using commercial heats and welding procedures in order to attain results relevant to the materials in the field. Thermodynamic calculations were performed to add confidence in phase identification as well as understanding of the evolution of the microstructure with temperature. Ti(C,N) banding was found in all materials. Bands with few large Ti(C,N) precipitates had negligible effect on the microstructure, whereas bands consisting of numerous small precipitates were associated with locally finer grains and coarser M23C6 grain boundary carbides. The Ti(C,N) remained unaffected in the HAZ while the M23C6 carbides were fully dissolved close to the fusion line. Cold deformed solution annealed Alloy 690 is believed to be a better representation of this region than cold deformed TT Alloy 690.

Place, publisher, year, edition, pages
Hindawi Publishing Corporation, 2014. Vol. 2014
Keyword [en]
nickel-base, banding, heat affected zone
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
URN: urn:nbn:se:kth:diva-152635DOI: 10.1155/2014/504927OAI: diva2:750669

QC 20140930

Available from: 2014-09-29 Created: 2014-09-29 Last updated: 2014-09-30Bibliographically approved

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