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Abstract

The mechanism of fatigue fracture in an interstitial free steel sheet has been studied. The process can be divided into four regimes:

(i) the fatigue crack initiates on the specimen surface, from the mesocracks along the grain boundaries in stage I

(ii) propagates mostly in an opening mode through grain boundaries in stage II

(iii) propagates through microscopic striations and transverse intergranular cracking briefly in stage III

(iv) the crack path changes from flat to slant along with through thickness necking and it propagates to failure through discrete crack jumps in stage IV. The crack jumps are associated with crack progression marks (CPMs), the spacing of which increases exponentially from few micrometres to few hundred micrometres with crack length.

Keywords

SHEET FATIGUE FRACTURE STRIATIONS CRACK PROGRESSION MARKS INTERGRANULAR CRACKING

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On mechanism of fatigue fracture in interstitial free steel sheet

Abstract

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References