Phenomenology of Hydrogen Flaking in Nuclear Reactor Pressure Vessels*

Autor:	Séverine De Vroey, S. Huysmans, Evy De Bruycker, Jacqueline Stubbe
Rok vydání:	2014
Předmět:	Fabrication Materials science Hydrogen Mechanical Engineering Metallurgy chemistry.chemical_element Materials testing Nuclear reactor Microstructure Casting Pressure vessel law.invention chemistry Mechanics of Materials law General Materials Science Literature study
Zdroj:	Materials Testing. 56:439-444
ISSN:	2195-8572 0025-5300
DOI:	10.3139/120.110580
Popis:	Recently, the problem of hydrogen flaking resurfaced, when internal defects were detected in the reactor pressure vessels of two Belgian nuclear power plants. These defects turned out to be hydrogen flakes formed during the fabrication of these pressure vessels. The goal of this publication is to provide important insights into the phenomenon of hydrogen flaking, the different parameters that play a role in the mechanism, as well as the typical morphology and location of these flakes. Therefore an extensive literature study was combined with a detailed metallurgical characterization of a significant number of flakes. Hydrogen flaking is a fabrication problem, which is strongly linked with segregation phenomena. A combination of a sufficient amount of hydrogen, stresses and a sensitive microstructure causes hydrogen flaking. For these reasons hydrogen flakes inside large reactor pressure vessels are found in the so-called ghost lines, which originate from segregation processes during casting.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::28a751bbd985492644e6fab632045df7 https://doi.org/10.3139/120.110580 Zobrazit plný text záznamu