A novel nondestructive method, based on step by step measurement of minor magnetic hysteresis loops was used to determine the neutron irradiation induced degradation of nuclear reactor pressure vessel steel material. This method is called Magnetic Adaptive Testing (MAT), and two types of reactor steel material were investigated: base material type 22NiMoCr37 and weld material type 18MND5. Charpy geometry samples were irradiated by neutrons at the BR2 in SCK•CEN. The neutron irradiation generated structural changes in the material. As a result of our measurement, it was shown that this degradation could be detected by MAT measurements. Charpy impact tests were also done on the investigated samples and the results of these measurement were compared with the nondestructively determined magnetic quantities. It was shown that a closely linear correlation existed between the ductileto-brittle transition temperature (DBTT) and MAT parameters.
|Number of pages||7|
|Journal||IOP Conference Series: Materials Science and Engineering|
|State||Published - 2020|
|Event||HMSC12 - 12th Hungarian Conference on Materials Science - Balatonkenese|
Duration: 13 Oct 2019 → 15 Oct 2019