Hydrogen-assisted crack propagation in α-iron during elasto-plastic fracture toughness tests
Journal article, Peer reviewed
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Original versionMaterials Science & Engineering: A. 2019, 756 396-404. 10.1016/j.msea.2019.04.084
Elasto-plastic fracture toughness tests of a commercially pure iron were performed in air and in hydrogen gas at two different pressures. Some unique characteristics of hydrogen-enhanced cracking were exhibited at both the macroscopic and microscopic length scales, based on the observation of fracture surface, fracture plane, plasticity distribution and dislocation structure. The possible mechanisms responsible for the hydrogen-induced degradation of fracture toughness are discussed.