SYMPOSIA PAPER Published: 01 January 1988
STP24497S

A Model for Life Predictions of Nickel-Base Superalloys in High-Temperature Low Cycle Fatigue

Source

Extensive characterization of low-cycle fatigue damage mechanisms was performed on polycrystalline René 80 and IN100 tested in the temperature range from 871 to 1000°C. Low-cycle fatigue life was found to be dominated by propagation of microcracks to a critical size governed by the maximum tensile stress. A model was developed which incorporates a threshold stress for crack extension, a stress-based crack growth expression, and a failure criterion. The mathematical equivalence between this mechanistically based model and the strain-life low-cycle fatigue law was demonstrated using cyclic stress-strain relationships. The model was shown to correlate the high-temperature low-cycle fatigue data of the different nickel-base superalloys considered in this study.

Author Information

Romanoski, GR
Massachusetts Institute of Technology, Cambridge, MA
Antolovich, SD
Georgia Institute of Technology, Atlanta, GA
Pelloux, RM
Massachusetts Institute of Technology, Cambridge, MA
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Details
Developed by Committee: E08
Pages: 456–467
DOI: 10.1520/STP24497S
ISBN-EB: 978-0-8031-5035-5
ISBN-13: 978-0-8031-0944-5