Nondestructive investigation of neutron irradiation generated structural changes of reactor steel material by magnetic hysteresis method

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  • MTA - Centre for Energy Research
  • HAS - Hungarian Academy of Science

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The neutron irradiation embrittlement of four dierent types of nuclear pressure vessel materials (three base metals and one weld material) were investigated by a magnetic nondestructive testing method, magnetic adaptive testing (MAT). The method is based on the measurement of minor magnetic hysteresis loops on Charpy specimens irradiated by neutrons in the BR2 reactor. Due to the neutron irradiation, the structure of the material was modified. The Charpy impact method is suitable for destructive characterization of material embrittlement. The results of Charpy impact test measurements at SCK CEN Belgian Nuclear Research Centre were compared with the nondestructively measured magnetic parameters. A definite correlation was found between magnetic descriptors and the ductile-to-brittle transition temperature (DBTT), regardless of the type of material or irradiation condition. The results suggest that this “calibration curve“ can be used to estimate the DBTT from non-destructive measurements.


Original languageEnglish
Article number642
Pages (from-to)1-11
Number of pages11
Publication statusPublished - 15 May 2020


  • Steel degradation, Nuclear reactor pressure vessel, Magnetic NDT, Magnetic adaptive testing, Neutron irradiation

ID: 6891496