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Micromechanics of Hydrogen-Assisted Damage in Progressively Drawn Pearlitic Steel
Last modified: 2013-02-10
Abstract
This paper analyzes the evolution of hydrogen-assisted damage topographyin progressively drawn pearlitic steels. The fractographic analysis revealed changes in themicroscopic topographies depending on the fracture propagation mode, with an evolutionfrom pure tearing topography surface (TTS) in slightly drawn steels to a kind of verydeformed TTS (in direction of cold drawing or wire axis) in heavily drawn steels. An imageanalysis technique was used to analyze the different microscopic fracture modes, thusfinding correlations between them. Results showed that the very deformed TTS reallyobserved in heavily drawn steels could be virtually obtained by deforming –in the drawingdirection– the micrograph of slightly drawn steels. This fact provides bases to elucidate thereal physical micromechanism of hydrogen-assisted fracture in pearlitic steels.
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