Abstract
The factor that plays the essential role in hydrogen degradation has been examined for Inconel 625 and iron by means of tensile testing with interposed unloading and reloading with/without hydrogen charging. Aging at 30℃ or annealing at 200℃ was conducted at the unloaded stage in order to diffuse out hydrogen or to anneal out strain-induced defects. Hydrogen thermal desorption analysis was used to evaluate strain-induced defects that act as trapping sites of hydrogen. Fracture strain decreased in the initially hydrogen-charged specimens even though hydrogen was absent at the late stage of straining. Annealing at 200℃ at the unloaded stage almost completely recovered the decrease in fracture strain.
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