Abstract
Evidence for the occurrence of uniformly distributed voids within the matrix of a nuclear grade 304 stainless steel during high temperature low cycle fatigue (LCF) has been presented previously by the authors. Based on the detailed investigations carried out employing various microstructural conditions, it was inferred that either quenching the alloy from a very high solutioning temperature or prior cold working of the material is a necessary prerequisite to cause homogeneous cavitation in the grain interiors during LCF deformation. In order to determine the stage at which the uniform matrix voids form and to understand the underlying mechanism in the formation of these voids. TEM studies were undertaken on samples cycled to a predetermined fraction of the fatigue life (N/sub f/). The results of this study should help to clarify the mechanism and lead to a better mechanistic basis for modelling uniform matrix cavitation in high temperature fatigue.
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