The effect of external high-pressure H2 gas on fatigue-crack growth behavior has been examined using a ferritic-pearlitic low carbon steel. The presence of hydrogen accelerates the crack growth rate by ≈13 times compared to the uncharged state and shifts the fracture surface morphology from ductile striations to a mixture of “flat” and “quasi-cleavage” features. The common feature found in the microstructure immediately beneath the hydrogen-induced fracture surface is enhanced plasticity in terms of refined dislocation cell structures and dense dislocation bands.
Effect of Hydrogen on Fatigue-Crack Growth of a Ferritic-Pearlitic Low Carbon Steel
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Nagao, A, Wang, S, Nygren, KE, Dadfarnia, M, Sofronis, P, & Robertson, IM. "Effect of Hydrogen on Fatigue-Crack Growth of a Ferritic-Pearlitic Low Carbon Steel." Proceedings of the ASME 2017 Pressure Vessels and Piping Conference. Volume 6B: Materials and Fabrication. Waikoloa, Hawaii, USA. July 16–20, 2017. V06BT06A048. ASME. https://doi.org/10.1115/PVP2017-66273
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