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Title:Magnetic analysis of nuclear pressure vessel steels and other ferromagnetic materials subject to neutron irradiation and heat treatment
Author(s):Shong, Wei-Ja
Doctoral Committee Chair(s):Stubbins, James F.
Department / Program:Nuclear, Plasma, and Radiological Engineering
Discipline:Nuclear, Plasma, and Radiological Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Engineering, Nuclear
Engineering, Metallurgy
Engineering, Materials Science
Abstract:Mechanical and magnetic property changes due to neutron irradiation and heat treatment were investigated for the sake of developing a nondestructive method of monitoring nuclear pressure vessel steel embrittlement during reactor operation. Four kinds of samples, including pressure vessel steel, pure Fe and Ni, Fe-Cu alloys and Charpy surveillance coupons, were examined. An automated magnetic property measuring system was constructed and measuring schemes were established. Microhardness and magnetic coercivity, remanence, permeability, and hysteresis loss were measured as a function of a variety of irradiation and annealing exposures. The results were interpreted in terms of dislocation and magnetic domain wall pinning mechanisms and internal stress relaxation. It is found that the pinning mechanisms of dislocations and domain walls are different with respect to the effective pinning parameters. However, stress relaxation has similar effects on both microhardness and magnetic coercivity. It is concluded that the selection of testing material, specimen size and shape, and magnetizing scheme are important factors for constructing a nondestructive testing method for reactor pressure vessel surveillance.
Issue Date:1995
Rights Information:Copyright 1995 Shong, Wei-Ja
Date Available in IDEALS:2011-05-07
Identifier in Online Catalog:AAI9624498
OCLC Identifier:(UMI)AAI9624498

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