Time-dependent fatigue behaviour is of considerable interest to the designers of elevated-temperature equipment subjected to periodic thermal transients that can introduce both creep and fatigue damage. In this review the effects of various phenomena such as creep-induced intergranular cavitation, mean stress, material condition, and enivronment on the fatigue life of several engineering structural alloys are discussed. Materials used to illustrate these effects when subjected to various loading conditions within the creep range include 2.25Cr-1Mo steel (annealed), modified 9Cr-1 Mo steel (normalized and tempered), types 304 and 316 stainless steel, alloy 800H, Hastelloy X, and alloy 718. Several models used to extrapolate available data to predict cyclic life are also discussed in terms of both their strengths and apparent shortcomings. No model currently available is clearly superior in its ability to predict cyclic life for all alloys under all loading conditions envisioned, particularly at low strain ranges with long creep hold periods, which occur in many service applications.
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