Dynamics detection between hydrogen and dislocations in materials and hydrogen degradation mechanism using advanced analysis

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Hydrogen desorption behaviors of pure iron with a body-centered-cubic (BCC) lattice and Inconel 625 with a face-centered-cubic (FCC) lattice were examined during tensile deformation using a quadrupole mass spectrometer in a vacuum chamber integrated with a tensile testing machine. Hydrogen desorption did not increase under elastic deformation. In contrast, it increased rapidly at the proof stress when plastic deformation began, and reached its maximum, then decreased gradually for both pure iron and Inconel 625. This desorption behavior is considerable related to hydrogen dragging by dislocation mobility. This interaction between dislocations and hydrogen causes to enhance lattice defects in metals, and then reduce elongation.