Changes in magnetic properties of neutron irradiated RPV steel

Author

Park, Duck-Gun ; Hong, Jun-Hwa ; Ok, Chi-II ; Jang-Whan Kim ; Kim, H.C.

Author_Institution

Korea Atomic Energy Res. Inst., Taejon, South Korea

Volume

34

Issue

4

fYear

1998

fDate

7/1/1998 12:00:00 AM

Firstpage

2036

Lastpage

2038

Abstract

Conventional magnetic parameters and Barkhausen noise have been measured in pressure vessel steel samples both as-received and irradiated with doses of up to 10¹⁸ n/cm². The conventional magnetic parameters, i.e. coercive force, remanence and maximum induction did not change significantly with irradiation, whereas the Barkhausen noise amplitude and energy during a magnetization cycle decreased markedly with irradiation dose. A three stage variation of Barkhausen noise with neutron dose was observed in the present work, namely an initial decrease, a near plateau and rapid decrease. The three stage variation with neutron dose is in qualitative agreement with computer simulations of the radiation damage process performed by Beeler (1965). The hardness also varied in three stages in a reverse manner with transition at the same doses

Keywords

Barkhausen effect; alloy steel; coercive force; dislocation motion; dislocation pinning; ferromagnetic materials; fission reactor materials; magnetic domain walls; magnetic noise; microhardness; neutron effects; nondestructive testing; pressure vessels; radiation hardening; remanence; B-H loop; Barkhausen noise; NDE; coercive force; coercivity; defect clusters; dislocation motion; domain wall motion; magnetic properties changes; magnetization cycle; maximum induction; microhardness; neutron dose; neutron irradiated RPV steel; radiation damage; radiation hardening; reactor pressure vessel steel samples; remanence; three stage variation; Coercive force; Magnetic noise; Magnetic properties; Magnetization; Neutrons; Noise level; Noise measurement; Pressure measurement; Remanence; Steel;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.706784

Filename

706784