Negative creep in nickel base superalloys

Kristian Vinter Dahl, John Hald

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    Abstract

    Negative creep describes the time dependent contraction of a material as opposed to the elongation seen for a material experiencing normal creep behavior. Negative creep occurs because of solid state transformations that results in lattice contractions. For most applications negative creep will have no practical implications but under certain conditions it may become critical. For bolts and fasteners, which are highly constrained during service, negative creep may lead to dramatically increased stresses and eventually to failure. The article was inspired by a recent failure of Nimonic 80A bolts in German gas turbines. As a result of this failure similar bolts from Danish gas turbines of the same type were investigated and it was found that the bolts had experienced negative creep during service.
    Original languageEnglish
    Title of host publicationBaltica VI : Life Management and Maintenance for Power Plants
    EditorsJuha Veivo, Pertti Auerkari
    Volume1
    Place of PublicationFinland
    PublisherVTT
    Publication date2004
    Pages329-343
    ISBN (Print)951-38-6291-7
    Publication statusPublished - 2004
    EventBALTICA VI : Life Management and Maintenance for Power Plants - Helsinki
    Duration: 1 Jan 2004 → …
    Conference number: 6

    Conference

    ConferenceBALTICA VI : Life Management and Maintenance for Power Plants
    Number6
    CityHelsinki
    Period01/01/2004 → …

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