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Initiation and Growth of Cavities and Cracks along Grain Boundaries in Type 304 Stainless Steel under Creep-Fatigue Condition

Initiation and Growth of Cavities and Cracks along Grain Boundaries in Type 304 Stainless Steel... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Mechanics of Time-Dependent Materials Springer Journals

Initiation and Growth of Cavities and Cracks along Grain Boundaries in Type 304 Stainless Steel under Creep-Fatigue Condition

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References (10)

Publisher
Springer Journals
Copyright
Copyright © 1999 by Kluwer Academic Publishers
Subject
Physics; Polymer Sciences; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation Materials; Mechanics
ISSN
1385-2000
eISSN
1573-2738
DOI
10.1023/A:1009882719312
Publisher site
See Article on Publisher Site

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.

Journal

Mechanics of Time-Dependent Materials – Springer Journals

Published: Sep 1, 1999

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