Investigations on aged Ti-stabilised stainless steels

Ulla Ehrnstén, Päivi Karjalainen-Roikonen, Pertti Nenonen, Ritva Korhonen, Boris T. Timofeev, Alexandr A. Bloomin

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

    1 Citation (Scopus)


    Mechanical and microstructural properties of cast material of type O8X8H10TL and wrought and welded stainless steel pipe material of type O8X8H10T have been determined, aged at NPP operation temperature for about 100 000 h and 200 000 h, respectively. The mechanical properties were determined using tensile testing, impact energy determination and fracture resistance testing. The microstructures were studied using optical, scanning and transmission electron microscopy. The mechanical properties of the cast Ti-stabilised stainless steel material are evaluated to be only slightly affected by long term (~100 000 hours) operation at NPP operation temperature. Also the effect of even longer (~200 000 hours) operation on wrought Ti-stabilised pipe material is very small, as the properties of the aged material are within the normal range of as-manufactured material. The mechanical properties of the Mo-alloyed stainless steel weld metal after ~200 000 hours of operation are still good, although indications of changes due to thermal ageing were observed.
    Original languageEnglish
    Title of host publicationPlant Life Management
    Subtitle of host publicationProgress for structural integrity
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    ISBN (Electronic)951-38-6281-X
    ISBN (Print)951-38-6280-1
    Publication statusPublished - 2003
    MoE publication typeB3 Non-refereed article in conference proceedings
    EventPlant Life Management: Progress for structural integrity - Espoo, Finland
    Duration: 1 Jan 20021 Jan 2002

    Publication series

    SeriesVTT Symposium


    SeminarPlant Life Management


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