Abstract
It has been understood that the effect of hydrogen on the fracture process of a notched specimen under rapid (impact) loading can be neglected, and under static loading hydrogen would induce the delayed fracture of the specimen. But under slow loading, hydrogen atoms tend to diffuse in the hydrostatic stress field ahead the notch root and accumulate in the location with maximum hydrostatic stress. The accumulation of hydrogen atoms has significant effect on the fracture process due to the decohesive effect of hydrogen atoms. 2.25 Cr-1Mo steel has been extensively employed as hydrogenation reaction vessel material used at elevated temperatures and under hydrogen containing environments. After long service, a large number of hydrogen atoms would remain within the reaction vessel wall and induce the premature fracture of the steel under external loading. However, there has not yet been investigation on the action of hydrogen atoms in the fracture process of notched specimen of this steel under slow loading. Such a study was performed in the present work.
Published Version
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