SYMPOSIA PAPER Published: 01 January 1988
STP24499S

Elevated Temperature Fatigue-Creep Behavior of Nickel-Base Superalloy IN 625

Source

A research program has been carried out to establish the low-cycle fatigue and creep-fatigue behaviors of Inconel 625 at elevated temperatures (650 and 815°C). The main observations were related to the effect of temperature and of hold times. Under continuous cycling, a temperature increase from 650 to 815°C caused a reduction in the fatigue life by a factor of 2 at a high strain and by a factor of 3 at a low strain.

Tension hold times had little detrimental effect on cyclic life at 650°C concerning the life reduction with respect to continuous cycling; at 815°C, on the other hand, this became more significant. Compressive hold times also had a damaging effect on fatigue life, and this was larger than that associated with tensile hold times; in particular, it was very pronounced for low strain levels at 815°C.

An analysis of data using a life prediction method previously suggested for creep-fatigue combination loadings has also been carried out. The method takes into account the damaging effect due to a compression hold time separately from that due to a tensile hold time in interspersed creep-fatigue loadings. The overall correlation between theoretical calculations and experimental results is reasonably good, for strain levels ranging from 1.2 to 0.4%.

Author Information

Bui-Quoc, T
Department of Mechanical Engineering, Ecole Polytechnique, Montreal, Quebec, Canada
Gomuc, R
Department of Mechanical Engineering, Ecole Polytechnique, Montreal, Quebec, Canada
Biron, A
Department of Mechanical Engineering, Ecole Polytechnique, Montreal, Quebec, Canada
Nguyen, HL
Industrial Materials Research Institute, National Research Council Canada, Boucherville, Quebec, Canada
Masounave, J
Industrial Materials Research Institute, National Research Council Canada, Boucherville, Quebec, Canada
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Details
Developed by Committee: E08
Pages: 470–484
DOI: 10.1520/STP24499S
ISBN-EB: 978-0-8031-5035-5
ISBN-13: 978-0-8031-0944-5