SYMPOSIA PAPER Published: 01 January 1982
STP32427S

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

Source

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.

Author Information

Mottot, M
Commissariat à l'Energie Atomique, Division de Metallurgie et d'Etudes des Combustibles Nucléaires, Saclay, France
Pétrequin, P
Commissariat à l'Energie Atomique, Division de Metallurgie et d'Etudes des Combustibles Nucléaires, Saclay, France
Amzallag, C
Creusot Loire, Centre de Recherches d'Unieux, Firminy, France
Rabbe, P
Creusot Loire, Centre de Recherches d'Unieux, Firminy, France
Grattier, J
Electricité de France, Centre de Recherches des Renardières, Moret Sur Loing, France
Masson, S
Electricité de France, Centre de Recherches des Renardières, Moret Sur Loing, France
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Details
Developed by Committee: E08
Pages: 152–168
DOI: 10.1520/STP32427S
ISBN-EB: 978-0-8031-4835-2
ISBN-13: 978-0-8031-0713-7