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

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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

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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.

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


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