STP770

    Behavior in Fatigue-Relaxation of a High-Creep Resistant Type 316L Stainless Steel

    Published: Jan 1982


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    Abstract

    In order to predict long-term behavior of a high-creep resistant low-carbon Type 316L stainless steel under low-cycle fatigue with long hold times, a series of tests of fatigue relaxation was undertaken at 550, 600, 650, and 700°C for medium strain ranges (Δεt = 0.7, 1.2, and 1.6 percent). Hold times up to 5 h were introduced at the maximum tensile strain. It has been shown that a reduction of fatigue life occurred, generally associated with intergranular cracking when hold times increased. A maximal effect was observed at 600°C.

    Different methods for extrapolating results for very long hold times, such as those encountered on fast breeder reactor components (∼1000 h) were proposed. These methods were based on a time-temperature equivalence comparable to those used for extrapolating creep rupture data. A correlation between reduction of fatigue life with the amount of stress relaxation during hold times was also used. Predictions by these methods are compared with ASME N47 fatigue design curves.

    Keywords:

    creep fatigue interaction, Type 316 stainless steel, high temperature design, stress relaxation


    Author Information:

    Mottot, M
    Commissariat à l'Energie Atomique, Division de Metallurgie et d'Etudes des Combustibles Nucléaires, Saclay,

    Pétrequin, P
    Commissariat à l'Energie Atomique, Division de Metallurgie et d'Etudes des Combustibles Nucléaires, Saclay,

    Amzallag, C
    Creusot Loire, Centre de Recherches d'Unieux, Firminy,

    Rabbe, P
    Creusot Loire, Centre de Recherches d'Unieux, Firminy,

    Grattier, J
    Electricité de France, Centre de Recherches des Renardières, Moret Sur Loing,

    Masson, S
    Electricité de France, Centre de Recherches des Renardières, Moret Sur Loing,


    Paper ID: STP32427S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP32427S


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