Abstract
The effect of hold-times on the fatigue life of 316 steel tested in oligocyclic fatigue is tentatively explained in terms of damage produced by grain-boundary sliding. Measurements of grain-boundary sliding published recently by Gates and Horton are used to quantify this concept and are applied to some published data for the endurance of Type 316 austenitic stainless steel tested in oligocyclic fatigue. The assumptions necessary for the inclusion of results of grain-boundary sliding measured in creep experiments in the oligocyclic fatigue situation are given and discussed. The calculated values of grain-boundary sliding are compared with experimentally determined values in a magnesium alloy. The calculations indicate that grain-boundary sliding correlates the effect of hold-time at a given temperature but that other factors have to be taken into account. Those factors—grain-boundary carbide precipitation or segregation—are briefly discussed.
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