Hydrogen-assisted crack propagation in α-iron during elasto-plastic fracture toughness tests

Hydrogen-assisted crack propagation in α-iron during elasto-plastic fracture toughness tests

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 fractu...

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Veröffentlicht in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2019-05, Vol.756, p.396-404
Hauptverfasser: Birenis, Domas, Ogawa, Yuhei, Matsunaga, Hisao, Takakuwa, Osamu, Yamabe, Junichiro, Prytz, Øystein, Thøgersen, Annett
Format: Artikel
Sprache:eng
Schlagworte:
Crack propagation
Dislocation structures
Dislocations
Electron back-scattered diffraction (EBSD)
Fracture surfaces
Fracture toughness
Heat treating
Hydrogen
Hydrogen embrittlement
Iron
Transmission electron microscopy (TEM)
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Zusammenfassung: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.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2019.04.084