In situ Synchrotron X-Ray Measurement of Strain Fields near Fatigue Cracks grown in Hydrogen

In situ Synchrotron X-Ray Measurement of Strain Fields near Fatigue Cracks grown in Hydrogen

M. Connolly, P. Bradley, A. Slifka, D. Lauria, E. Drexler

The embrittlement and enhanced fatigue crack growth rate of metals in the presence of hydrogen is a long-standing problem [1-5]. In an effort to determine the dominant damage mechanism behind hydrogen-assisted fatigue crack growth, we performed high-energy x-ray diffraction (HEXRD) measurements to characterize the strain fields near cracks grown both in air, as well as in a hydrogen environment. An enhancement in the magnitude and spatial extent of the strain field near the crack grown in hydrogen compared with the strain field near the crack grown in air was observed. We discuss the differences between the measured in-air and in-hydrogen crack-tip strain fields in the context of the two leading damage mechanisms proposed in the literature.

Keywords
Strain, Hydrogen, Fracture, Fatigue, Synchrotron, Diffraction

Published online 4/20/2018, 6 pages
Copyright © 2018 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: M. Connolly, P. Bradley, A. Slifka, D. Lauria, E. Drexler, ‘In situ Synchrotron X-Ray Measurement of Strain Fields near Fatigue Cracks grown in Hydrogen’, Materials Research Proceedings, Vol. 4, pp 17-22, 2018

DOI: https://dx.doi.org/10.21741/9781945291678-3

The article was published as article 3 of the book

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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