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|Title:||Effect of Hydrogenation on Fracture Mode of a Reactor Pressure Vessel Steel|
|Authors:||NYKYFORCHYN H; TSYRULNYK O; STUDENT O; TAYLOR Nigel|
|Citation:||PHYSICOCHEMICAL MECHANICS OF MATERIALS vol. 45 no. 5 p. 5-16|
|Publisher:||Karpenko Physico-Mechanical Institute|
|Type:||Articles in periodicals and books|
|Abstract:||The conditions for hydrogen-induced intergranular fracture in an artificially embrittled, low-alloyed reactor pressure vessel were investigated using fracture toughness and stress corrosion cracking tests. The specimens were taken from two locations: the heat affected zone beneath the cladding and the base material directly below the heat-affected zone. A hydrogenating system allowed the tests to be carried out on both pre-hydrogenated specimens or with continuous hydrogenation during testing itself. Overall the results demonstrate a detrimental effect of hydrogen on sub-critical crack growth resistance of both materials. At 120¿C (close to the upper shelf) it led to a lower energy ductile fracture mode and isolated instances of transgranular fracture. At ambient temperature (in the ductile to brittle transition regime) some mixed intergranular and transgranular sub-critical crack growth was observed.|
|JRC Directorate:||Energy, Transport and Climate|
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