Abstract
Crack growth experiments have been carried out under combined creep and fatigue loading at 700° C on a hot isostatically pressed powder nickel alloy. A fractographic investigation has been undertaken of the modes of failure over a frequency range of 0.001 to 10 Hz. The observations indicate that under static loading and at low frequencies failure is intergranular and controlled by creep processes, whereas at high frequencies a transgranular fatigue fracture is obtained. The transition from creep to fatigue behaviour is found to be progressive, and to begin at a lower frequency the higher the ratio of cyclic to mean load. In the transition region a mixed intergranular and transgranular fracture surface is observed, which correlates well with the recorded proportion of creep to fatigue crack growth.
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Winstone, M.R., Nikbin, K.M. & Webster, G.A. Modes of failure under creep/fatigue loading of a nickel-based superalloy. J Mater Sci 20, 2471–2476 (1985). https://doi.org/10.1007/BF00556076
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DOI: https://doi.org/10.1007/BF00556076