Cavitation Studies on Type 304 Stainless Steel Subjected to Strain Controlled Fatigue Deformation

This paper presents the transmission electron microscopic results on cavitation during low cycle fatigue of type 304 stainless steel at 923 K. Direct evidence is provided for the possible sites which enhance stress concentration and favour the nucleation of cavity embryo.In addition to cavities at heterogeneous sites, voids of diameter 30-40 nm are found homogeneously distributed within the matrix, associated with a "void denuded zone" near grain boundaries.The prior metallurgical state of the material which favours the formation of such voids is identified.The possible mechanisms for the homogeneous distribution of voids in the grain interiors are discussed.

Abstract licence: CC BY

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