Short-range ordering of Alloy 690 aged for 10 000 h at 420, 475 and 550 °C

Roman Mouginot, Teemu Sarikka, Ulla Ehrnstén, Young Suk Kim, Sung Soo Kim, Hannu Hänninen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    Alloy 690 is used in critical components of nuclear power systems. It has a high intergranular stress corrosion cracking (IGSCC) resistance, but questions remain concerning its long-term primary water stress corrosion cracking (PWSCC) resistance during the service life of pressurized water reactor (PWR) components. To study the effect of thermal ageing, four conditions of Alloy 690 (solution annealed, coldrolled and/or heat-treated) were aged at 420, 475 and 550 °C for 10 000 h and characterized by SEM, EBSD and nanoindentation. Thermal ageing of Alloy 690 triggered intergranular (IG) carbide precipitation and all conditions showed evidence of short-range ordering (SRO), with the start of a disordering reaction at 475 °C. Prior heat treatment induced ordering prior to thermal ageing, as compared to water-quenched specimens. IG carbide precipitation increased with increasing ageing temperature, as well as diffusioninduced grain boundary migration (DIGM).
    Original languageEnglish
    Title of host publicationBaltica X
    Subtitle of host publicationInternational Conference on Life Management and Maintenance for Power Plants
    EditorsPertti Auerkari
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Number of pages8
    ISBN (Electronic)978-951-38-8436-9, 978-951-38-8435-2
    Publication statusPublished - 2016
    MoE publication typeA4 Article in a conference publication
    EventBALTICA X - International Conference on Life Management and Maintenance for Power Plants - Cruise, Helsinki-Stockholm, Finland
    Duration: 7 Jun 20169 Jun 2016

    Publication series

    SeriesVTT Technology
    Volume261

    Conference

    ConferenceBALTICA X - International Conference on Life Management and Maintenance for Power Plants
    Abbreviated titleBaltica X
    CountryFinland
    CityHelsinki-Stockholm
    Period7/06/169/06/16

    Keywords

    • Alloy 690
    • thermal ageing
    • short-range ordering
    • Ni2Cr
    • carbide precipitation
    • heat treatment
    • cold work

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  • Cite this

    Mouginot, R., Sarikka, T., Ehrnstén, U., Kim, Y. S., Kim, S. S., & Hänninen, H. (2016). Short-range ordering of Alloy 690 aged for 10 000 h at 420, 475 and 550 °C. In P. Auerkari (Ed.), Baltica X: International Conference on Life Management and Maintenance for Power Plants VTT Technical Research Centre of Finland. VTT Technology, Vol.. 261 http://www.vtt.fi/inf/pdf/technology/2016/T261.pdf