@article{59d5ce8a77614ff6a9ee9e13130baac4,
title = "Assessment of the impact of hydrogen on the stress developed ahead of a fatigue crack",
abstract = "The microstructure generated in a low carbon steel under cyclic loading in air and a 40 MPa gaseous hydrogen environment has been compared as a function of distance from the crack tip. The presence of hydrogen resulted in the formation of a smaller and more equiaxed dislocation cell structure that extended further from the crack tip than the one generated in air. This enhancement and extension of the dislocation structure by hydrogen is consistent with it modifying the generation rate and mobility of dislocations as well as dislocation interactions. Qualitative assessment of the dislocation structure ahead of the crack tip found the stress ahead of the crack tip to vary linearly as ln(1/x), where x is the distance from the crack tip irrespective of the test environment. Hydrogen caused a shift to higher stresses, implying the critical damage level for crack propagation will be achieved more rapidly with a concomitant increase in the crack propagation rate.",
author = "Shuai Wang and Akihide Nagao and Petros Sofronis and Robertson, {Ian M.}",
note = "Funding Information: SW and IMR gratefully acknowledge the support of the National Science Foundation through Award No. CMMI-1406462. AN acknowledges the support from JFE Steel Corporation. PS gratefully acknowledges the support of the International Institute for Carbon Neutral Energy Research (WPI-I2CNER), sponsored by the World Premier International Research Center Initiative (WPI), MEXT, Japan. The electron microscopy was carried out using facilities and instrumentation at the University of Wisconsin-Madison which is partially supported by NSF through the Materials Research Science and Engineering Center (DMR-1121288). Funding Information: SW and IMR gratefully acknowledge the support of the National Science Foundation through Award No. CMMI-1406462 . AN acknowledges the support from JFE Steel Corporation . PS gratefully acknowledges the support of the International Institute for Carbon Neutral Energy Research (WPI-I2CNER) , sponsored by the World Premier International Research Center Initiative (WPI) , MEXT , Japan. The electron microscopy was carried out using facilities and instrumentation at the University of Wisconsin-Madison which is partially supported by NSF through the Materials Research Science and Engineering Center ( DMR-1121288 ). Publisher Copyright: {\textcopyright} 2019 Acta Materialia Inc.",
year = "2019",
month = aug,
day = "1",
doi = "10.1016/j.actamat.2019.05.028",
language = "English",
volume = "174",
pages = "181--188",
journal = "Acta Materialia",
issn = "1359-6454",
publisher = "Elsevier Limited",
}