Non-uniform hydrogen attack cavitation and the role of interaction with creep |
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Authors: | MWD van der Burg E van der Giessen |
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Affiliation: | Delft University of Technology, Laboratory for Engineering Mechanics, 2628 CD Delft, The Netherlands |
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Abstract: | Hydrogen attack (HA) is the development of grain-boundary porosity by cavities filled with high-pressure methane that originates from the reaction of carbides with hydrogen at high temperatures. The cavities grow by grain-boundary diffusion and by creep of the adjacent grain material till they coalesce with neighbouring cavities to form a microcrack. Earlier work on HA has focussed on unit cells containing a single cavity, using average cavitation properties. Here, non-uniform cavitation properties on the grain-size scale are assumed in a polycrystalline aggregate, and unit cell analyses are performed to investigate the influence of the adjacent grains on the development of the grain-boundary HA. The numerical results are explained in terms of two simplified models which highlight the key parameters governing the grain deformation-grain boundary cavitation interaction process. |
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Keywords: | Hydrogen attack Cavitation Creep |
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