Abstract
To obtain a fundamental knowledge of the combined effect of neutron-irradiation and hydrogen, mechanical properties and the fracture mode were studied for pure neutron irradiated iron, followed by hydrogen charging. The effect of interaction between neutron irradiation and hydrogen absorption for a pure iron could be clarified. Under the hydrogen charged condition, the ductility is higher in the neutron irradiated specimen than in the unirradiated. The cause could be sought in hydrogen trap sites of the iron and the fracture mode. As a result of interaction between many irradiation defects and hydrogen atoms, the fracture mode of a hydrogen charged specimen after irradiation, is a mixed mode of quasi-cleavage crack and dimple pattern. That of a hydrogen charged unirradiated specimen is predominantly intergranular cracking.
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