Cyclic crack growth evaluation of a 20MnMoNi55 piping steel in high-oxygen reactor water

Pertti Aaltonen, Rauno Rintamaa, Hannu Hänninen, Ulla Ehrnsten, Esko Arilahti

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    Samples of a low alloy steel piping material taken from the full scale corrosion fatigue test loop of the Heissdampfreaktor (HDR) plant have been tested at 240°C in high oxygen reactor water. The small-scale specimens (CT25) were exposed to a similar loading spectrum to that which has been used in the full-scale corrosion fatigue tests at the HDR-plant. During the autoclave tests cyclic crack growth rates were determined. Fracture surface investigations were performed not only for the laboratory test specimens but also for the fracture surface of a sample taken from the HDR test loop piping after the full scale test. In this paper the autoclave testing results and fracture surface observations are presented and compared to those obtained in the HDR piping tests.

    Original languageEnglish
    Pages (from-to)111 - 122
    Number of pages12
    JournalNuclear Engineering and Design
    Issue number1
    Publication statusPublished - 1993
    MoE publication typeA1 Journal article-refereed


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