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Title: Magnetic measurement to evaluate material properties of ferromagnetic structural steels with planar coils

Abstract

The mechanical properties of a nuclear reactor pressure vessel (RPV) are degraded by fast neutron irradiation during operation. This is well-known as so-called as radiation embrittlement of RPV and an important problem to be considered in the assessment of residual life of the nuclear reactor. Hence the development of nondestructive means is required to measure directly the degree of material degradation in RPV. Here, nondestructive measurement experiments were carried out with a planar coil to evaluate changes of material properties of ferromagnetic structural steels. Examined steels were of A533B that is a low-alloy steel and of SUS410 that is a martensitic stainless steel. The planar coil has two windings; one is of primary for excitation and the other secondary for induction of output voltage. The coil was placed on a test plate with a magnetic yoke for application of a bias dc magnetic field, and excited with a constant current of 25 Hz. Then the output voltages were measured while slowly changing the bias field by excitation of the magnetic yoke with a triangular-wave form current of 0.005 Hz. Changes of output voltages with different test plates were correlated with their mechanical and magnetic properties. The correlation is so goodmore » that this measuring method could be applied to nondestructive evaluation of material degradation in ferromagnetic structural steels.« less

Authors:
;
Publication Date:
Research Org.:
Japan Atomic Energy Research Inst., Tokai, Naka, Ibaraki (JP)
OSTI Identifier:
20000827
Resource Type:
Journal Article
Journal Name:
IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers)
Additional Journal Information:
Journal Volume: 35; Journal Issue: 5Pt2; Conference: 1999 international magnetics conference (Intermag '99), Kyongju (KR), 05/18/1999--05/21/1999; Other Information: PBD: Sep 1999; Journal ID: ISSN 0018-9464
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 22 NUCLEAR REACTOR TECHNOLOGY; 42 ENGINEERING; PHYSICAL RADIATION EFFECTS; MAGNETIC TESTING; STEEL-ASTM-A533-B; STAINLESS STEEL-410; REACTOR MATERIALS; FERROMAGNETIC MATERIALS; EMBRITTLEMENT; MAGNETIC PROPERTIES; MECHANICAL PROPERTIES

Citation Formats

Ebine, Noriya, and Ara, Katsuyuki. Magnetic measurement to evaluate material properties of ferromagnetic structural steels with planar coils. United States: N. p., 1999. Web. doi:10.1109/20.800711.
Ebine, Noriya, & Ara, Katsuyuki. Magnetic measurement to evaluate material properties of ferromagnetic structural steels with planar coils. United States. doi:10.1109/20.800711.
Ebine, Noriya, and Ara, Katsuyuki. Wed . "Magnetic measurement to evaluate material properties of ferromagnetic structural steels with planar coils". United States. doi:10.1109/20.800711.
@article{osti_20000827,
title = {Magnetic measurement to evaluate material properties of ferromagnetic structural steels with planar coils},
author = {Ebine, Noriya and Ara, Katsuyuki},
abstractNote = {The mechanical properties of a nuclear reactor pressure vessel (RPV) are degraded by fast neutron irradiation during operation. This is well-known as so-called as radiation embrittlement of RPV and an important problem to be considered in the assessment of residual life of the nuclear reactor. Hence the development of nondestructive means is required to measure directly the degree of material degradation in RPV. Here, nondestructive measurement experiments were carried out with a planar coil to evaluate changes of material properties of ferromagnetic structural steels. Examined steels were of A533B that is a low-alloy steel and of SUS410 that is a martensitic stainless steel. The planar coil has two windings; one is of primary for excitation and the other secondary for induction of output voltage. The coil was placed on a test plate with a magnetic yoke for application of a bias dc magnetic field, and excited with a constant current of 25 Hz. Then the output voltages were measured while slowly changing the bias field by excitation of the magnetic yoke with a triangular-wave form current of 0.005 Hz. Changes of output voltages with different test plates were correlated with their mechanical and magnetic properties. The correlation is so good that this measuring method could be applied to nondestructive evaluation of material degradation in ferromagnetic structural steels.},
doi = {10.1109/20.800711},
journal = {IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers)},
issn = {0018-9464},
number = 5Pt2,
volume = 35,
place = {United States},
year = {1999},
month = {9}
}