Abstract
The substructural development during high temperature low cycle fatigue of type 304 stainless steel has been investigated by transmission electron microscopy. Hour glass type specimens have been tested to different fractions of fatigue life under a total strain range of 2% with a cyclic strain rate of 4 × 10 −3 sec −1 at 649°C. Cells were observed to form within 0.4% of the fatigue life well before the onset of the saturation state which was reached after 4% of the fatigue life. It was also found that the cell intercept size decreases until the saturation state is reached and that the misorientation angle between adjacent cells and the volume fraction occupied by cells increases throughout the fatigue life. The observations are discussed in terms of the recent theoretical predictions.
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