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Non-destructive detection of flaws during manufacture and operation of components

: Walte, F.
: Kernforschungsanlage Jülich GmbH -KFA-

Jülich, 1989
Berichte der Kernforschungsanlage Jülich - Conferences
Workshop on Structural Design Criteria for HTR <1989, Jülich>
ISSN: 0344-5798
Conference Proceedings
Fraunhofer IZFP ()
Austenit; Grobkorn; Oberflächenrißprüfung; Regelwerk; Röntgenprüfung; Schwächung; Streuung; Ultraschall

The nondestructive testing (NDT) in the field of quality assurance of components in the light water reactor (LWR) technology is today very well established, nevertheless not all NDT methods are transformable to the case of high temperature reactor (HTR) components. The reason is the coarse grain structure of the austenitic material used in the HTR-technology in opposite to the fine grain structure in the case of ferritic material in the LWR-technology. Mainly the ultrasonic (UT) testing, which plays the dominant rule in the LWR inspection, is influenced by the coarse grain austenitic or nickelbase alloys structure. The present article analyses the influence of the coarse grain especially the dendritic structure in welds of austenitic and nickelbase alloys, discusses methods and ways to detect flaws in austenitic and dissimilar welds and gives a practicable rule for NDT in the field of HTR components with a combination of ultrasonic and X-ray inspection techniques.