Abstract
Creep-fatigue tests of Type 304 stainless steel were carriedout using smooth round bar specimens. Cavities and small cracksinitiated inside the specimen were observed on the cross-section bymeans of a scanning laser microscope. The results obtained aresummarized as follows. (1) From the beginning of the creep-fatigue test,spherical cavities appear at random locations on grain boundaries, oneafter another. (2) The cavities on the grain boundaries perpendicular tothe stress axis preferentially grow, and change shape from spherical toflat oblate (or crack-like). (3) When the ligament area on a grainboundary plane reduces to a half, the cavities coalesce and bring abouta complete break of the grain boundary, which is defined as theinitiation of a small crack. (4) Mean growth rate of cavities and crackslocates in the vicinity of the crack propagation law which can bederived from the relationship between the propagation rate of largecrack and creep J-integral range fortime-dependent fatigue of Type 304 stainless steel.
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