☆ 4.7 Article

Hydrogen-induced cracking at grain and twin boundaries in an Fe-Mn-C austenitic steel

SCRIPTA MATERIALIA (2012)

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期刊

SCRIPTA MATERIALIA
卷 66, 期 7, 页码 459-462

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2011.12.015

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Austenitic steel; Tension test; Electron backscattering; Hydrogen embrittlement; Twinning

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Nanoscience & Nanotechnology Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering

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  1. Japan Society for the Promotion of Science for Young Scientists

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Hydrogen embrittlement was observed in an Fe-18Mn-1.2C (wt.%) steel. The tensile ductility was drastically reduced by hydrogen charging during tensile testing. The fracture mode was mainly intergranular fracture, though transgranular fracture was also partially observed. The transgranular fracture occurred parallel to the primary and secondary deformation twin boundaries, as confirmed by electron backscattering diffraction analysis and orientation-optimized electron channeling contrast imaging. The microstructural observations indicate that cracks are initiated at grain boundaries and twin boundaries. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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